Embrace change! We've just made some adjustments to the Halo: Reach Beta and introduced a new flavor of Slayer inside the Grab Bag playlist. Along with a host of under-the-hood technical type stuff that you don't need to be too concerned about, here's the list of alterations you'll definitely wanna know about:

* Grab Bag’s “SvE Slayer” pits Spartans vs. Elites
* Spartan DMR Loadout removed from Invasion Phase 1
* CTF Flag return proximity slightly increased
* Headhunter skull pickup radius increased
* Same team Stockpile flag removal and re-scoring resolved

Emphasis mine.

Well, that's a start.