The official FMA website has been updated with details on the Hagaren Song File -Best Compilation- CD, which will contain all of the Hagaren Song File character tracks, plus a few new versions of select tracks. There are also two new tracks, titled "LAST MEETINGS" and "Good!", and it looks like those are going to be sung by all 5 of the featured HSF characters: Ed, Roy, Al, Winry and Maes. The last name I'm not sure of, but I'm going to guess that it's Maes.
Released When? December 21, 2005
How Much? 3,360 yen (3,200 yen without tax)