Once the Python-qt bindings are optified I don't see a huge benefit in using C++. It's more native, but I think Python would take less maintenance effort: especially when the next device hits.

Not saying I think C++ is bad.. I'll likely use it at some point as well. But python is quite snappy, the overhead at being interpreted doesn't seem to be a big issue. And, just one executable for armel/i386. That's always nice .