Currently me and my brother both have a PS3, and I've got several accounts in all the major regions. I basically needed to do this because of DLC and online passes for games that are from different regions.

At present I have a Plus subscription on a UK based account and on a US based account. My question is will I be able to switch between the accounts and download the plus downloads and share the accounts with my brother the way I can do right now?

Because Plus is needed to use online multiplayer on PS4, i've heard that maybe the PS4 will tie into an account some what like the Vita does (which i hate, as i can only get plus games from one account at a time since i only have one memory card). Would it be possible for me to to use the UK plus to go online, and my brother to use the US one to go online on his PS4, but we both have the accounts on our own PS4s as well to download freebies?

Additionally I read that only one account needs a plus subscription on a system for all accounts to get online multiplayer. Is this confirmed?

Thanks guys!

Edit: Clarity