I once built Qwt from SVN trunk with Qt5 alpha successfully. For the Qwt 6.0 and 5.2 branches I have not decided what to do - not until at least a Qt 5 beta with a stable API is available.
But I wouldn't expect too much from using Qwt and Qt 5.0 - until widgets and quick stuff can coexist ( planned maybe for Qt 5.1 ) I don't see many good reasons for upgrading an application using Qwt to Qt 5.
Unfortunately it will need some time to reorganize the Qwt plot framework, so that it can be used optionally without widgets. But this time please don't blame me for all the related API incompatibilities ...
Uwe
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