Some of em, not all of em though. Here’s a list of the weapons that were new in Halo: Reach and my responses to them in Halo 4. All weapons that were in the original Halo trilogy are excluded:
MA37 Assault Rifle: Nah, I want the old MA5C Assault Rifle from Halo 3, but maybe some tweaks on the range and power, but I want that old style assault rifle back, the skeletal look of the MA37 was cool only for a short amount of time and then it just grew old.
M392 DMR: HELL NO! This gun practically ruined Halo. I never liked how they replaced the Battle Rifle for this. I want the Battle Rifle back and no return of the DMR.
Grenade Launcher: I think this would do well for a return. I liked it for it’s EMP capabilities making it great against air support. Along with the new grenade launcher pistol we saw in the teaser trailer, this’ll be pretty good to have.
Target Locater: This should make a return too. It was a great anti-armor/air weapon. Return please.
Needle Rifle: Eh, this is iffy in my opinion. I kinda liked this gun, but at the same time I didn’t. I think they should just leave this gun in Reach and bring the Carbine back. It was a fun rifle to use. Plus I don’t want this game to stray to far away from Halo 3 because this takes place right after Halo 3.
Concussion Rifle: This is iffy too. I guess we can leave this in Reach and go back to the Brute Shot.
Plasma Repeater: I think this shouldn’t make a return, because we still have the classic Plasma Rifle.
Plasma Launcher: This should definitely make a return. It was a fun Covenant weapon. Great against air and armor.
Focus Rifle: Eh, I think the Sentinel beam should come back and keep this gun out. The old Covenant sniper should be the Covenant sniper rather than the Focus Rifle.
Remember, these are all in my opinion. Not sure if the UNSC and Covenant are making a return in Halo 4, but if they do, grenade launcher, target locater, and plasma launcher should be the only Reach weapons that return.