I installed Qt 5.9.0 Beta 1 through the online installer. The system does not provide QtWayland and thus is useless on a Wayland platform.
Steps to reproduce:
1. Run a Wayland session (e.g. Plasma or Weston)
2. Download the unified installer (qt-unified-linux-x64-2.0.5-2-online.run)
3. Install Qt 5.9.0 Beta 1
4. Try to use it
Not working as QtWayland is missing.