Apparently method of registering thumbnailers has changed in gnome3 so this package has to be updated to support it (here's an example based on gnome-nds-thumbnailer):
This should be reported to upstream, but I don't know how to contact him :(
(In reply to comment #1)
> This should be reported to upstream, but I don't know how to contact him :(
I have sent him two emails (for different issues) but haven't heard back from him :(
I guess we still need this package and cannot be simply treecleaned, no? :(
well, there is no replacement that I known of.
gnome-raw-thumbnailer-3.0.0 is in portage now, so closing.