You'll note that this is the full Firefox interface, and not the Fennec/Firefox Mobile UI; we're testing with the full interface because it's significantly more complex than the mobile UI and stresses Gecko much more. So, if the full UI works, then Fennec should work fine as well. Given the interest in Android on netbook and tablet devices, an updated version of the full Firefox UI might find a home on some of these. Android has been pretty great to work with so far; it's a bit unusual platform for us due to its Java core, but with the NDK we're able to bridge things together without many problems.
We're still a ways to go before any kind of usable alpha release, but we're certainly one step closer.