Well according to many sources, Kevin Bacon has been confirmed to be in X-Men first class, though not much is known about his role. In other X-Men news, Kick-Ass’ Aaron Johnson has been rumored to play Scott Summers and James McAvoy has been confirmed as Professor Charles Xavier. If any or all of these are true, this next X-Men movie could be very, very exciting.
One last thing, it has been rumored that if First Class is successful you can expect to see an X-Men 4. X4 probably relies on the success of Deadpool and Wolverine 2 as well.