Yes, there will be forge mode in Halo 4.
No, players will not be able to play as an Elite in mutliplayer mode in Halo 4. Confirmed by 343i.
Yes, 343 Studios (The creators of Halo 4) have confirmed and showed a demo of the upcoming forge.
Halo 4 will not have "survival mode" (by the way it's called firefight) like Reach and ODST, but it will have Spartan ops, which is essentially a second campaign based on a spartan other than Master Chief.
nope only 2 players
slayer is the standard multiplayer game mode of team death match
Halo 4 has excessive blood, including shedding blood as you hit a corpse. Also, the flood mode is somewhat graphic. Halo's history as an M game contributes, too.
If you preordered Halo 4 and have the assassin emblem code, you can use it by going to your spartan's emblem and looking for it in the foreground option.
Halo 4 is called Halo 4.
Yes, most likely
Yes, Halo 3: ODST will feature offline cooperative Firefight mode.
Halo rights are owned by Bungee. Technically Halo 4 is "Halo ODST"