Nothing official. Just from my memory what I remember reading somewhere. As I know Maemo 6 aka Harmattan will be released, only marketing is calling it MeeGo. It still good old Maemo under the hood... with deb and other things. It will be compatible with MeeGo, but you'll have to work around things if you want to install things from the MeeGo repositories. It should come out by the end of this year... and as it looks like it will be the stepchild of Nokia, just like the N900 was... Will it be available for the N900... will have to wait and see.