Well, mystery solved, no dark conspiracy against mameo and/or GTK at Nokia...

It seems all of them got snatched up by a mysterious "well-funded" startup in London, called LiTL, of which little is know except that it's "developing a consumer product that involves hardware, software, and online services". A total first, certainly.

See :
http://blogs.gnome.org/xan/2008/04/14/joining-litl/
and others.