I have to agree that Scirra is all about the waiting, wait for this feature, wait for this announcment, i've been patiently waiting for C3 and got C2 in a browser, now have to wait again for it to become something more, only now you have to pay to wait.
Also does the build service extend to desktop support or is it simply mobile? I can't remember desktop support being addressed since C3 was announced.