I've heard several different figures; the last time I heard, it was $300 for people earning less that $3000 (so, people who would get everything back anyway), $600 per person (so, $1200 per married couple) up to $75,000, and $300 per child per eligible married couple. But every time I look it's something different - and don't forget, this is all speculation at the moment; until it actually passes in the House and the Senate, nothing is fixed. This article from the Chicago Tribune seems to cover some of the details in the proposal well - at least, it matches what I heard on the news last night.
Thanks for the information.