Will this FM2 CPU Connect to a FM2+ Motherboard?

FM2+ motherboards are backwards compatible with all FM2 and FM2+ CPU's, but NOt FM1 CPU's.

You should be fine.

source: http://wccftech.com/amd-fm2-socket-kaveri-apu-compatible-trinity-richland/
 



Ok but won't the pin size be different?
 


nope. pin size is exactly the same.
 


yeah, you should be perfectly fine.

just like AM3+, which was backwards compatible with AM3 processors such as Phenom II's.