I went to Canon's website and looked at them (now that they're officially announced). Looks like the the R7 is a mirrorless 90D and digic X processor with IBIS and upgraded video capabilities (Canon Log3). Not meant to be the 90D replacement, but instead the 7DII replacement using the 90D sensor (no BSI, etc). Not exactly cutting edge, but a good combination for birders, etc, and still very performant. I'm confused about the apparent lack of a battery grip accessory though. Even the 80D/90D/7D series had that. Maybe Canon hasn't announced that yet, or maybe the existing grip for the R6/R5 will also work with it. For a "pro level" it's a bit weird that there isn't one out of the gate.
The R10 looks like either the 80D or M50MkII or 77D sensor paired with Digic X. No dual card slots, no IBIS, smaller battery, more pedestrian features. etc. Smacks of entry level digital rebel, which is totally fine. At less than $1K, they'll sell a lot of them.
The R7 strikes me as the 7D line replacement and the R10 the rebel line replacement, which leaves the 80D/90D line ambiguous. Granted, the 90D blew the doors off the 7DII in many ways, but still was missing "pro level" features like dual card slots, so the R7 with dual card slots tells me this body is the "pro level" APS-C. Maybe there isn't enough differentiation between the 80D/90D and 7D series in mirrorless land to make doing a mirrorless version of them worth it, which I'd actually be fine with too as the R7 is literally a $300 difference from the 90D, so maybe the R7 is a merged 7D/90D line and what they have now is all the differentiation that will happen except maybe at some point the EF-M line replacment.
All in all, a good RF APS-C initial level set. It'll only go up from here.