So what kind of things are you wanting from Reach? Put it down here, it doesn't matter how small it is.
Here's mine:

Bring back the Needler's Halo 1 melee. Jabbing needles in their face FTW!!
Decrease the Needler's power and make them dual-wieldable again.
Make a fast UNSC vehicle that one player can drive and shoot with (tank is slow, Hornet isn't fast...enough).
Tell the story from multiple perspectives (ala Halo 2 and ODST).
Have the Arbiter make an appearance.
Have at least one level where you play as the Master Chief.
Have the Sniper Rifle's scope show a clear image when not zoomed in, not that green crap in Halo 3.
Have the main enemies be a mix of Elites and Brutes. Imagine taking on a Brute Chieftan and an Elite Zealot at the same time!
Keep ODST's pistol.
Take the silencer off of the SMG. It doesn't have the same kick in ODST as it does in Halo 3.
Let us play as the Spartans in "The Fall of Reach." I'd love to play as Linda, Fred, or Kelly.
Let us play in some vehicles from Halo Wars. Grizzly or Wolverine anyone?

Got something you'd like to add to that, or think I'm an idiot who should never make a game? Speak!