Marshmallow (Developer version ) is already available and being tested on Nexus 6 & 9. As it is not being tested on the Venice, I imagine that device is not being treated similarly to Nexus devices and must wait to get M with other Android manufacturers. Marshmallow is expected to release before end of October. Even with a close alliance between Google and Blackberry, I am hard pressed to believe that Venice will release with Marshmallow before Christmas.