I don’t know if they showed a new planet, but it looked vaguely like place where Maz Canata lived. Maybe she had a bunch of other Jedi junk lying around. Then again maybe it’s just a generic forest world.
I assumed it was a vision as soon as I watched it and I suspect most people did. Not really a slip up on the official discussion leak.
It didn’t stop all the evil clone discussions.
I thought it might be Endor. The hippie festival Rey and co. come upon looks like it could be an Ewok thing?
Didn’t some of the early concept art for Ep 9 show Yavin 4? That would be my guess as to where the ‘new’ Resistance base is, and where Rey is training with the probe.