When your bikes arrive, I'll be curious which frame, crank and tires they actually come with. Two photos currently on the
Rockstar web page show different set-ups.
In the greyscale pic below, the motor's integration is horizontally oriented with the crank, but in the yellow one, it's angled upward which is probably better for off-road use.
The grey's downtube appears to be considerably fatter and differently-angled, its chainring comes with a guard, and the tires are Schwalbe Nobby Nics. The specs say "Maxxis 27.5 x 3.0."
My hunch is that you'll be getting the grey version, albeit painted yellow. That's what's shown at the top of the Rockstar's page (bottom pic below).
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