Originally posted by biz-engineer My feeling below.
DFA... 300: Unlikely
Why is a D-FA 300mm unlikely? In my opinion it is about the most likely in this list. The DA* 300 is good optically, is already an FF lens but needs AF motor update in order to function better with the new generation of cameras.....
Regarding the 24-70; They probably want a* lens in this range built to the new demanding Pentax * standards. I suspect the current Tamron rebadge was a stop gap measure in order for them to have FF lenses available at the launch of the K-1. They were probably uncertain of how the K-1 would be received in the marked.