If I correctly read between the lines there's more updates coming to Maemo5.

I also don't understand why everyone (almost) expected that there should be Maemo6/MeeGo for N900?

1) MeeGo apps will work on N900 whatever OS it's running
2) Maemo is going to have updates and enhancements
3) there's probably going to be unofficial port of MeeGo for the adventurous anyway

I don't deny that I would have been happier if Nokia made end user MeeGo for N900 also, but in the end it's really not that important considering the reasons above. First MeeGo HW is coming out in the end of the year, so N900 is 1 year old already, surely geegs need a new HW fix every year anyway.