Lars says that they are aiming for the Qt 5.1 feature freeze to happen towards mid-March, which is later than anticipated, but Digia developers right now are busy on getting out the Qt 5.0.2 point release. This later feature freeze should also help the merging of Qt Android support and Qt Quick Controls. With the mid-March freeze, Lars expects to have Qt 5.1 officially released by the end of April.
Aside from everything that's already been merged, he also is proposing that several of the Qt modules left out of the 5.0 release be integrated. The candidates he's looking at for the modules that be added for Qt 5.1 include Qt X11 Extras, Qt Mac Extras, Qt Sensors, Qt Serial Port, and Qt Quick Controls.
He shared these new Qt 5.1 details in the development list for the Qt Project. The big feature to Qt 5.1 will be Google Android support for the tool-kit while it also has improved support for Wayland and OpenGL changes.