With the CR123 Minimus, the tube held the cell. Now it appears the 2AA go into the (large) black box behind the tube. So what's in the tube now, empty space? Or does the tube hold one of the two AAs? And why do we need a Borg-type external wire? Wouldn't that get hung up on things, provide an entry point for water, and be a point of weakness/failure?
It seems to me that a 2AA Minimus required a redesign, and SF decided to just modify the CR123 version a little instead. Looking at the design, I wish they'd just made an in-tube 1AA design and kept the nifty sleek tube design...narrower and a bit longer for an AA. As is, I think you're going to have quite a bit of "weight forward" with this design. I really like AA headlamps, but for the Minimus I think I'd be more likely to pony up for the CR123 high CRI version.
I can't help but compare this 2AA Minimus against the Spark SD52, and I think they got the SD52 a lot more compact and integrated. (And brighter.)