I really hope that a lot of these models are going to be making the cut for 40k. It seems like there is just so much pointing towards a Mechanicum addition to regular 40k these days, that those of us that have dreamed of one for years, may be finally getting our wish. Of course the big word of contention is "may".
Either way, there is a lot of models for the Mechanicum already available from Forgeworld. Please remember that we have no real information on when these are coming out, and very little information about the pics, so please take them as rumor.
Here a link to the image from Dakka. Its at the bottom of the page.