With Nokia selling Qt to Digia and Nokia getting rid of one of the Qt offices, which were changes that already harmed the Qt 5.0 release and caused sadness among developers, Qt 5.0 is slow on the final stretch.
Qt 5.0 Beta was due around July, then was postponed to early August, and now it's the end of August and it looks like it will ship simply when it's ready. The August Beta was with expectations to then ship Qt 5.0 final in November, after previously they were hoping to ship in September, etc.
For those wondering how to help out, a Qt developer has published a list of the most pressing issues that need to be resolved for the Qt 5.0 Beta. The handful of important bugs range from OS packaging problems to QMLScene not working and Mac Trackpad gestures not being properly supported.
Now it looks like we will probably see the Qt 5.0 Beta in September.