Although it's quite possible the specs for the A2L will be changed when it's released, as was the case with the LX2, I suspect there will still be a pretty significant difference in runtime on low between these two models. I'm no expert in electronics or LED technology, but I'm guessing it takes more power to light up four separate LED's than it does to light a single LED, even when the four are individually set to lower brightness settings. Plus, do we know the ballpark for the efficiency of those small flood LED's on the A2L? Is it anywhere close to the Cree Q5/R2/whatever bin is in the LX2?
Anyway, I'm also trying to decide between the A2L and LX2. I think it'll end up depending on how throwy the high beam of the A2L is, and how floody its low beam is. I currently carry both a C2/M60/FM34 and an L1 (sometimes with F04), and am hoping that one of the two new models can take care of the range of uses I get with my current EDC. Now, if the A2L can get close to the same throw as my M60 on high, and the same flood as my L1 w/ F04 on low, then it'll be a must-have.
I don't suppose anyone here could say how the flood of the original A2 on low compares to an E- or L-series TIR w/ F04 diffuser? I know the A2L low will differ from that of the A2, but it's at least a place to start.