We haven't completely decided what the device will ship with, but are leaning towards vanilla Pd. We were just playing around with Pd-extended this week, but have not been able to get the same level of reliability compared to vanilla. Pd-extended requires so many more dependencies that have to be sorted out and this is more challenging on an embedded device compared to a larger desktop OS environment. Things like OpenGL for GEM.
In terms of offering solid reliability during both editing and playing, we will probably keep the current strategy of Pd vanilla and cherry picking some externals.... right now we use some of the OSC objects and network objects..
But down the line, yes there might be an update for Pd-extended, and I'd like to keep the discussion open. How important do you think this is? do you imagine most Pd users are using extended? what are the most popular externals (perhaps we can include some more of them in the initial vanilla release) ?