A lot of people are guessing Megaman is going to be in this Wednesday (a day before E for All). There's a cryptic message posted on Capcom's website that reads:
http://blogs.capcomusa.com/blogs/news.php/2007/10/10/prepare_yourself
A bunch of people are guessing the second line says "prepare yourself for a fight" or "prepare yourself for a brawl" which makes sense if you think about the title. Probably has nothing to do with Megaman, but we can always hope. There's supposed to be a Capcom conference this Wednesday I believe. Maybe we'll hear something then.
EDIT: Also found a timer to go with this: http://www.capcom-unity.com/
No way in hell.
I'll be plum surprised if Megaman is included before December, if at all. I'd love to see him, but it seems strange that Sonic, an obviously more popular character, would be announced first, if both are going to be at E for All.
Also, that timer looks very un-brawl. But I have to admit, my fingers are crossed.