*UPDATE 2 : Well since April 5, version 1.1.8 is officially available on our repo (www.themeitapp.com/repo) and works fine on 4.3.1 and now most themers are updating their themes to also make then compatible with the most recent iOS release.
note : use the Compatibility option in the application Themes > Sort Order Menu, that way you’ll instantly see what themes are compatible with you device
*UPDATE 1 : Today we sent out a beta version of the app that has been running smoothly on 4.3 here. As soon as we get confirmation it works for everyone we’ll prepare the public update.
The devs finally got their brand new devices today and are working like crazy to bring 4.3.1 compatibility.
It should be made available soon (now that they can actually do all the testing in local)
I’ll keep updating this post as soon as i get more feedback from them