There has been no "revelation" as to the resolution of the R3.
What, you mean that pure speculation on the part of armchair experts on a gossip forum is not a revelation from Canon?
You are posting on a Canon RUMORS forum! Why are you here if you can't stand a few harmless assumptions and product spec deducing?
I think it is pretty safe to assume, based on what Canon has released and what they have not said, that its going to be in the 20-32MP size.
If it had a 45MP sensor in it I'm pretty sure they would say it shoots 8K to get all the fanboys salivating.