ok heres something for that people who only believe in sources:
MeeGo-Harmattan
the default operating system of the Nokia N9. Successor of Maemo 5, but based of the Qt toolkit. Originally named Maemo 6, but later rebranded as MeeGo-Harmattan (provisional name). It is MeeGo compatible (that is, has a MeeGo API) but is not to be confused with MeeGo 1.0 Handheld as it is NOT based on MeeGo Core. MeeGo-Harmattan will not be released as a Nokia product for the N900. Aliases: Harmattan, Maemo 6.

quote from the meego wiki:
http://wiki.meego.com/Glossary

soooo no we will NOT have to wait until the official meego will come out