We don't know anything about any exclusivity. All we know is that WP is to be Nokias main smartphone OS not the only smartphone OS. This may very well be nikias choise, and not part of a deal as such.

The more I hear about WP8 at the monent, rumors that is, the more it sounds that it will not improve WP7s shortcomings in any substantial manner.

I have to be honest and say that if WP was a OK OS, I would understand Nokia. The problem is that Android is better in almost every single aspect, and almost all that is bad with WP is done so by design. The OS is simply awfull. Lots of games and stuff, but it's like a gameboy machine with a tiny tiny subset of the functionality of for instance android or harmattan.