CanonWatch.com indicates it was fed a rumor that the R10 will be the basis for a new astrophotography camera. That would replace the unavailable-since-September Ra camera that came out as Canon’s first R variant.
Making an astrophotography camera largely means monkeying with some of the filters typically placed atop the sensor to block out wavelengths of light not commonly desired in terrestrial photography.
The use of the lower-end R10 may disappoint some, who might have otherwise hoped the R7 would be used as the underlying body. Astrophotographers in the days of the DSLR often loved the 60Da, which was specced more to the level of the R7.