Seeing how Ed gave some interesting details in his interview with Northernlion today, I thought I'd compile them in a handy list. So, if you didn't have time to listen to the video (which you can, and should, by clicking here) then just follow along below.

First a quick disclaimer: Nothing here is definitively confirmed. There's still a lot of development time left, and Ed doesn't like to set things into stone. But, there's probably a good chance that most of these things will be a part of Rebirth. That said, Ed didn't confirm quite as much this time, at least compared to his interview with Twinfinite last year. But there's plenty of stuff to like in this interview, and I think Northernlion did a good job of keeping the conversation interesting even when they weren't focusing on Rebirth explicitly.

On to the juicy details...

• Progress Report: All of the pre-Rebirth content art has been completed, and now Nicalis is working on randomizing rooms and the new content exclusive to Rebirth.

• Ed says that he wants everyone who has played the flash version to have a reason to come back and pick up Rebirth. Rebirth will take advantage of its new engine, which means new content that was never before possible due to flash's technical limitations. Ed specifically hints at "bullet hell" and maybe even different sized rooms).

• Again, Rebirth will run much more smoothly than flash Isaac, so say goodbye to that chugging frame rate!

• It's been confirmed before, but there will be some sort of Chest analogue after beating Sheol. Ultimately Ed wants to make these two path parallel in terms of content.

• The Mystery Man: Ed has hinted at this character before, but this time we get a more explicit explanation how he works. The Mystery Man starts with random stats and a few random items, and then it's your job to go from there. You might get awesome stats or you might get terrible ones, it all depends on what you roll at the start of the run. The catch is that you have to pay some sort of token to play as the Mystery Man. You receive those tokens from beating mom's heart, so if you try and fail as Mystery Man you may need to go back to other characters to earn more tokens. Ed says there will be some balancing mechanic preventing you from rolling a super-powerful (or super under-powered) character right from the start.

• Rebalancing Soul Hearts: Soul hearts will not be able to go off the screen. Ed says "what you see is what you get." That means 12 heart containers max, including soul hearts! Ed points out that this will make the game harder for experienced players who know how to exploit soul hearts, not newbies who are still learning the ropes.

• Rebalancing Items and Trinkets: Some of the shittier items will get a buff. Others will be turned into trinkets. For example, wiggle worm is now a trinket, along with a host of new trinkets that will affect how your tears move.

• New familiars with differentiated abilities (meaning that they won't just be turrets)! In Rebirth you will be able to have more than 6 maximum familiars at the same time. Yay, new engine!

• There will be plenty of bug fixes as well as more clarity on what items do. A lot of the bugs associated with Isaac are due to the limitations of flash and Action Script 2. With the new engine you can expect items to behave as intended. Ed also wants to make the game a bit more clear on certain things for players. By that he doesn't mean flat out telling you what items do, but he does want the short item descriptions and displayed stats to actually be helpful and reflect what is actually going on.

• But there will more mystery as well. Ed wants the wiki to have to take a bit of time to catch up with all of the hidden content. The community will have to work together to find all of the extended secret areas (sort of similar to the secret areas in Spelunky).

• Rewards for completing bosses/floors/runs under certain times to incentivize speed runs. By reward Ed usually means a new item unlock.

• Rewards for ingenuity: What happens when I use the shovel in Sheol? Nothing in the current game, but Ed wants to reward players who try! Maybe if you try using items in interesting places you'll open up new content!

• Co-op Multiplayer: Ed has already hinted at some of this before, but it's worth re-mentioning. Multiplayer will be local only and Co-op based. A second player will be able to drop in and the game will scale accordingly. Both players will be on the same screen, however Ed affirms that there is "only one isaac". That means that Player 2 may be controlling a totally different character.

• There are also plans to allow players to compete in fair races in Rebirth. Although there is no online multiplayer, you will be able to get a code for a particular isaac run. You can send that code to a friend, and when entered in into the game it will generate the same rooms, enemies, items, and floor maps for both players. This will make it possible for players to share runs and thus make it a more fair competition if you and your buddy want to race to Sheol.

• Ed is not a fan of Isaac on touch screens, so I hope you're not holding out for Isaac for iPad.

• New cutscenes and voiceovers? Only time will tell. Ed say he will not just remake the old cutscenes with 16 bit graphics. Either he will reuse the old ones and add to them, or remake them all. Ed also wants to get more of Matthias Bossi's narration in the game (he voices the intro cutscene). Since Bossi is doing the music for Mewgenics, Ed's other game in development, it's certainly a possibility.

• A hint at one of the 100 new items! This was already covered by reddit user elucidater. Check out his post on the item (tiny planet) here and give him an upvote!

Well, I guess there was more confirmed tonight than I thought! Thanks again to Northernlion for doing this interview, and let's hope that Ed does that IAMA with you when we get closer to release!