Jason Snell wrote up a nice summary of the current rumors and his opinions on the upcoming iPad at Macworld. It seems a near certainty that we'll get at least one new iPad next month with Face ID since the current iOS 12 betas on iPad have gone out of their way to move all information to the top right and left of the screen, thus making room for a notch. That bit of evidence also makes me think the iPad Pro will have an edge-to-edge screen since the current iPad Pro design has plenty of room in the forehead to accommodate the Face ID sensors without adding a notch.
Another interesting point is that with an edge-to-edge screen, what will happen with finger detection on the edges? When the iPad was first released, Apple made a pretty big deal out of the fact that it needed borders so you could hold it without touching the capacitive screen on the device. I know they've been working around that on the iPhone but I expect that problem to be harder to solve on the iPad where everyone will nearly always have at least one finger holding (and touching) the front of an edge-to-edge screen.