Will we be allowed to invite people by typing in the name? Maybe I want to rematch someone I ran into in the game. I hope we can do this without having to add anyone to our friends list. Oh and in F4A, can we invite 3 friends instead of one like in the beta?
You have many options. You can send invites through the R2 menu while on the character select screen.
After a a match you can press Triangle to rematch.
And in the XMB if you go over to friends, there is a 'Players Met' section where you will see a list of players that you have literally just played a game with.
You'll be fine.