You can find a list with Q&A on the XDA Portal. Please read it, you will find many answers there.
Please install it only if you're willing to take the risk of boot loops. Just because it's working fine and stable for me doesn't mean it will work for everyone the same way.
Downloads:
xposed-v*-sdk21-*.zip: Must be flashed with a custom recovery to install the framework.
XposedInstaller_3.0-alpha*.apk: Must be installed to manage installed modules
No, it's not using material design yet. Yes, there are more important topics for now.
XposedBridgeApi-20150213.jar: The API for module developers, in case they want to make use of some new features. Might be changed slightly until the stable release!
Known issues:
- Bootloops on Samsung stock ROMs. That's due to Samsung's changes to ART. There are unofficial builds that work around this by deodexing and adjusting the ROM.
- Not working with LG encrypted apps.
For discussions, please use the other thread or another matching one in this subforum.