I don't think they'll make it to reach the 1K mark before the new 2.4 formula kicks in (which will reduce the power by some 20 percent).
As for the most powerful engine out there I'm pretty sure that Toyota currently produces some mid 900 figures... Mercedes Honda and Ferrari are obviously not far off either, but what really stuns me is Renault. How did they manage to improve so much over the winter? Engine power had been their Achiles Heel over the past few seasons and now suddenly... Bang.
Or is it that their chassis is soooo incredibly and unimaginably advanced that they easily compensate any lack of power.