http://www.aniplex.co.jp/hagaren/news/index.html#080822
There's going to be a Spring event for FMA on 4th April 2009 celebrating the FMA box set as well as having new "special footage" probably from the new series. Confirmed guests include Park Romi and Rie Kugimiya, so it looks like Al and Ed's voices are going to be retained at least. Fans don't need to worry about rioting.