Well necrons are the newest codex. Whoever is next will then be best and so on
Not true. Imperial Guard have been regarded as one of the best for a long while now, and they had their update years ago.
Looking at other things from the FAQ...
Praetorians now appear to be termie-killers, now that their staff is AP2. It sucks that it now has unweildly, so they will be striking at once with PF termies.
Orikan is also AP2 for his CC attacks, and he can re-roll the hits to boot!
But the bigggest winners here are the CCB and the Warscythe. That free +1 armor bonus will help a lot in close combat. And now the Warscythe, as mentioned before, is one of (or IS) the deadliest Close Combat weapons in the game. And you can practically say good bye to vehicles that they hit. Its pretty much the Broadside of Close Combat Weapons.
Also, did you all see the Anrakyr model in the Army Showcase? He looks frikken sweet.
Oh and one more thing. Because Monoliths are Skimmers, they get the Jink rule...so it now has a 5+ cover save.