I could see a AdMech army mini-dex being released, possibly something similar to the Tempestus mini-dex. At this point, it wouldn't be really that hard to do, there's already precedent. They'd basically be superguard with different toys, in much the same vein that Tempestus is, IMO. Allowing some of the FW HH Mechanicum units in 40k would also not be unheard of - we had Hydras and Manticores a long time before they had plastic models.
I'd take the rumor with as much salt as allowed however, since we've heard it before, again and again.
The 2 f's/ in giraffe/ are like 2 giraffes/ running through/ the word giraffe/ The 2 f's/ run through giraffe/ like 2 giraffes. (Ron Padgett)