anony_mouse
Banned
I don't think so, I tried Google and only find something like this: Statement from BlackBerry on Google Play / BlackBerry 10 rumors | CrackBerry.com I know it is month old article however probably nothing really changed meanwhile. I know Android apps can run on BB10 but that is not the same thing as full Google Play support. And why would Google allow competition to use their app store?
You are right that this seems to be rumour, not fact.
Google might do it because they make money from the Play Store. The more devices use the Play Store, the more money they make.