Looks like the new Jasper MoBo's power supply might be 150W:
here's the current supply from the same source:
(look at the model numbers, if you cannot figure out the rating from the numbers in the data)
Also, The lot numbers on the box seem to indicate the production date, if you can't see the actual date through the slot on the box -- the lot numbers appear to be (year) (week) (something I forget) -- so a box labelled lot number "0833xx" will have been produced on the 33rd week of this year (in August). So far, all lot numbers up to 0833xx have been Falcons, according to a few places around the web (up through August 11th or so production dates actually on the boxes).
MS said that the Jaspers wouldn't roll out until the end of August, or early September, so if you want one, I wouldn't try your luck with a machine with a lot number below 0835xx, or so. Honestly, I'd wait until I saw a 0836xx or later -- at the least. The first few Jaspers may even come with 175W power supplies, due to overstock.