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The pedals are pretty sinful, but is the crank not in fact a 'power meter spider' that fits to compact cranks, with standard rings? (Or they may actually be compact rings too). It looks like it rotated the rings' bolt tabs 36 degrees with respect to the cranks bolt tabs.
If so it may well be the budget crank based option the market is looking for.
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is the crank not in fact a 'power meter spider' that fits to compact cranks, with standard rings?
That's what it looks like. It also looks like the bastard grandson of William Heath Robinson and Rube Goldberg
New PowerTap product images seem like they should have been released on 1st April, not 16th March.