If their approach to Android is any guide, much of the work will consist of eliminating any GNU or GPL components from the (userspace) runtime environment.
Android: http://mjg59.livejournal.com/100221.html
Palm Pre: http://mjg59.livejournal.com/111453.html
"...overall the Pre has the appearance of being a well-engineered distribution. It's recognisably Linux in a way the Android isn't."
I'm not denying that they're doing it or anything, I just can't imagine why they'd bother.
In other words I don't think they care too much about gpl stuff since they built their own UI and bytecode interpreter where most of the action is anyway...
Google's approach to licences is far more nuanced than blind adherance or avoidance of any particular licence.