In Contact Harvest they had prototype BRs.
Honestly, that AR looks incredibly similar to Halo 3's. Throw in the artistic license, the screen below, and there's no way you could convince me they look any different.
http://media.1up.com/media/03/7/6/8/lg/842.jpg[/I
Considering it still has a 32 round magazine I fear it'll function the same as it did in Halo 3, spraying bullets all over the place. I was (am) hoping it'd have a shallower clip, a slower fire rate, and tighter spread. Couple that with [B]headshot hit detection[/B] and I'd be fine with the AR.[/QUOTE]
If that reticule isn't a place holder, it seems to indicate just that.