I think my only specific concern is; is it a good idea to design a game in Construct for mobile devices yet?
I have just ordered the Apple Developer account too, will r100 make it easy to test on iOS? This is really the only area I can see Stencyl is ahead at the moment as you can directly test on the device from the program. I know you can test using LAN but performance is unplayable at retina resolution and you can't test full screen (meaning touch controls often have to be moved to a different position, which makes it hard to get a feel for the game).
I'm mega excited about r100!!! (no pressure guys lol :)