What makes you like the new changes?

Before everyone starts hating on me I just want to say this is not a a hate thread thank you. I’m finally starting to calm down after all the new info I heard on Halo 4. I want to say I am a long time Halo fan and a competitive gamer.
So I know obviously not everyone hates the new info so I want to know why the people that like the new info like what they have heard so far (hope that sentence makes sense)? If you can I would like your opinion on all the new info leaked so forunner vision, AAs returning, drop in/drop out, everyone having sprint, custom loadouts, etc.