This screenshot has surfaced over on the CGSociety forums that shows Maya running with a QT-based interface. The QT widgets libraries run several applications, but how do you feel about a possible change in the next version of Maya?
Autodesk has been using QT for various products for quite some time (2007 press release). For reference, the existing MudBox 2010 and The Foundry’s Nuke runs on QT I believe. A good list of QT applications can be found on the Trolltech Website.