Here's some information about the C++11 usage within the recently released Qt 5.0 tool-kit.
In a KDAB blog post talking about the company's development contributions towards Qt 5.0, the C++11 support is covered.
Qt 5.0 uses more C++11 functionality
that was introduced in the latest ISO-approved update to the programming language.
For details on what KDAB contributed C++11-wise to Qt 5.0, see their blog post