Hmm … I just updated to iOS 6 (on an iPad 3) and notice that the openGL renderer no longer handles the zoom factor properly.
As long as I don’t use the openGL renderer, everything sizes properly.
Using the openGL renderer, everything is 2x as large as it should be on the pad.
I checked the jucedemo to see if the problem was there as well - yup. Clicking on the openGL demo works fine (but everything is waaaaay to big).