So, the Army makes its appearance (Then, the Assault Rifle isn't the MA5, but the MA37), Falcons become pilotable, and the AR finally sounds like it's a real gun.
That crosshair thing was a glitch in the screencapper, some awesome new explosive launcher exists, and sounds Covenant, and the BR will be there, too.
They've explained why the S-IIIs of Noble have MkV, and there will be changes to the control scheme.
Hot Bungie awesome. On that note, go to their website for the latest weekly update; they have the new sound effects for the AR, DMR, and SR, Frags, Plasmas, and some new gun...