I don't know why Moblin switched from Ubuntu to Fedora. While present in Moblin, its aspects like optimized quick booting and UXA for Intel graphics cards which are more interesting than Moblin itself. Or drivers for their sound cards, wireless cards (WWAN, WLAN).

All this is traditionally not directly interesting for Nokia or Maemo community so there is not much enthusiasm here. Well, unless Mer gets ported to Atom blahtops.

Meanwhile, WiMAX support arrived in Linux 2.6.29 and a while ago, the Intel graphics cards and wireless cards were interesting because there were open source drivers available but Atheros and AMD had the brilliant idea to join the bandwagon... other interesting projects from Intel are LessWatts.org and PowerTOP/LatencyTOP. But they're more necessary for laptops (and desktops/servers) than embedded stuff e.g. Nokia products.