The annoying thing is that right now, with the current resources, building a new device based on omap3 is easier and faster than noving fremantle to another device...

If more OS developer resources were available, probably the next hw platform with somewhat good linux driver availability would be the Allwinner series SoCs. I believe some of them have almost complete linux support, except for graphics. They're also mainly aimed for tablets and not quite as power lean..