From Gamer Escape Interview:

GE: So are there any other new systems we can expect to see at at launch 2.0 that we don’t have now?

Yoshida: One thing that will be implemented at 2.0 launch will be new instanced raids that will require alliances of 24 players. In addition, for these, and other instanced raids, we will be adding difficulty selections. So players can play on normal difficulty and get certain items, but then try again on a hard setting in order to obtain better items.

From the interview there will also be approximately 1 month that the servers will be in maintenance between 1.23 => 2.0 …. not kidding. So everyone should get battle field in the mean time.

suggest people read the interviews… SE didn't modify the existing game they literally made a new one more or less.