The rest of Qt 5 will arrive soon.
This is the same version that will be shipped in Jessie, so whatever you develop with it will work with the next Debian stable release :)
Don't forget: you better start porting your Qt4 apps to Qt5!
Note 2014-10-10: uups, it will still take a few days, but it will be there soon :)
Note 2014-10-15: currently building!