Sorry, I wrote that it was EST at some point but I edited it a lot or started over while writing it and I guess it got lost by the final version. Yes, EST.
As for the "stick with a class" thing, that's probably a good idea but sometimes it breaks down in practice when the most powerful weapons aren't for the class you've picked and you're not doing as much as you could be doing just because you are sticking to your class.
Basically, it should probably be a guideline.
Verification, yes, it'll be co-op and not PVP. I don't particularly care for PVP in Terraria, except maybe for organized games.
So, if you want to be in on this,
add me on Steam and vote for what days you want in the poll.