"On mobile, release cycles are different from the web, screen sizes are smaller impacting the user interface design, plus versioning is an important area to address."
They're doing tools for mobile. Hence the rebrand.
My Objective-C isn't great, but I'm willing to dust it off to try out the new products.
(Personally, I'm going to still develop for the web mainly, though. And do mobile apps as more of a intellectual exercise/fun).
Mobile's becoming increasingly important. If you saw the Mary Meeker slide deck, it's clear that growth isn't abating. It's an exciting space to be, and it's great to have more tooling around the area.