As I read the Congressional materials, it looks like peds' residencies have most funding in place for this year, but the proposed bill would increase that funding by about $30M, or 10%. If the proposed bill is not enacted, I don't see where there would be any funding for these residencies after FYE 2013, but I could be wrong on that; maybe the funding automatically renews on a year-by-year basis.
The report says there will be about $300M funding, and that the program funds about 40% of peds residents and fellows. There were about 2600 peds slots in the match, so about 7800 peds residents total, of which about 3100 would be funded by this program. I don't know how many peds fellows there are.