I don't know if it's stated definitively anywhere, but I'm pretty sure the plan is to roll out that different version to Chrome users as an update to the existing extension. It's going to be slightly worse because MV3 is still missing some API features.
The V3 version of ublock should really use a different name to make it clear it doesn't have the same capabilities as in V2/Firefox. Maybe something like UBlock use-firefox-instead.