Jani Heikkinen of Digia issued a notice this morning that the "Qt 5.3 feature freeze is coming quite soon" in that there's only four weeks left for feature work. The warning was issued on the development mailing list.
While Qt tool-kit releases have been subject to delays, the feature freeze is expected to go into effect on 14 February followed by an Alpha release one week later. The first Qt 5.3 Beta is expected in mid-March while the final Qt 5.3 version is expected in late April.
There is a page forming that covers the Qt 5.3 features on this page, which is rather bare at the moment. Among the Qt 5.3 features we know that are being worked on include printing improvements, Enginio cloud data storage, Android improvements, and performance and stability improvements.