I hate to be cynical, but it seems like the new series isn't worth the extra money over the current F series. If you can get an F90BT for $600 new (Amazon), is the X910BT really worth $1,100? It seems like the improvements are mostly software based and you can get the new software for $70...?
Edit: Also, if I read the press release correctly, the F90BT comes with the iPod adapter but the X910BT doesn't...?