There wasn’t an official announcement, but after your crazy petition and what Frankie said in SDCC (“I’m sure Halo 4 will have its own Armor Lock…”) when asked whether Halo 4 will have a new gameplay feature like all previous Halos, I highly doubt there will be AAs in H4.
You guys can calm down (still sign the petition, though). Stop making threads about this and just calm down until an official announcement. Every speck of knowledge we have on H4 leads me to think that there will be no AAs. But there might be sprint, and the thruster pack may appear in a space mission or two… But Armor Lock will not be there.
Also, while we’re at it, there will probably be no bloom either. The way fans received bloom , 343 would have to be really -Yoinking!- stupid to put it in the game (or at least in as bad a way as it was in Reach).