Over on the Yahoo Hero Forge board they seem to be at a wait-and-see stage, since the final rules are currently nebulous. But I think a chargen spreadsheet would be useful to facilitate the playtesting. I'm looking into converting my Star*Forge sheet for this purpose after this semester is over. Of course, that's what I said about Modern20 last semester. I almost finished that one, in fact, but then I got distracted working on a Savage Worlds chargen.
In the long run, I'm thinking I'll probably want to build my own D&D chargen anyway to accomodate custom rules.