From lordbeefy over on Warseer:
"Heard from my local blue shirt...
Skitarii book is on a par with the militarum tempestus book
Next book is the full adeptus mechanicus codexx
Third book is painting guide
There are two hq models, two heavies one a walker one is a more traditional vehicle design (?)..... the main codex will have significant decurion like formations with some really powerful special rules.
As rumours go its fairly bland or non specific but thought I would pass it on anywY"
According to H.M.B.C. on Dakka, he's heard it isn't on par with the Scion book. We'll know fore sure later.
the limited edition of the mechanicum codex will be limited only to 1010