It's not a full giant robot alert because it's just a couple new weapon pieces, but still, they're available to order for Adeptus Titanicus from Forge World. While you're there, swoop on over and pick up some new Aeronautica Imperialis fighters and bombers as well.
From the announcement:
Strapping all kinds of fancy weapons onto tried and true vehicles is a time-honoured tradition in the Imperial military. Whether it’s ancient Volkite weaponry or a staggeringly large bomb that tickles your fancy, Forge World has just the thing for you today.