1) I think there will be a software replacement update for all who own it already, but the PS3 one will still cost full price, even for original players.
2) Yes! Very easily although I'm only up to about 30 myself, and I think there's a lot of party content after that point.
3) I am in an incredible Linkshell and there's always someone to talk to and have a giggle with. Find one early on with a great social vibe, and you'll be fine!
4) I suck and have no idea what that says, but

Have some fun, get through the storyline, and just look forward to 2.0!