Is 2.5W for 1.9GH/s at the chip level, or the estimated draw at the wall?
Estimated draw at the wall means estimation? I think its an estimate as the chips were just tape-out or w/e yesterday.
Estimated draw at the wall means he's predicting a miner based on these will use 1.32J/GH, vs the chips themselves use 1.32J/GH and then you have to add in DC/DC losses, other draws (fan, controller, etc), and the AC/DC PSU loss.
As Bargraphics said, it would make the most sense at this point for it to be chip level, which would put it around the same mark as the Antminer chips. Probably looking at somewhere closer to 2J/GH at the wall when built into miners if they hit specs.