Android roadmap

Does anyone have information on the Android roadmap at Zebra?

1. Do we know when we'll have something past KK for the AT&T TC55?  Lollipop, Marshmallow..

2. Do we know when we'll have something past JB for the MC67?

3. In both cases, when an upgrade to the OS does arrive, can we assume it will be available for older devices?  If I have an MC67 running JB today is there a reasonable expectation that one day it might be running Marshmallow?  Same question for TC55.

 

Bonus question!  : )  Any information on when there might be a TC55 for Verizon voice and data running on 4G and with what OS?

 

Thanks for any help.

 

Gord