Has anyone installed the fan made unofficial patch yet? if so, should I download it or wait for the recently announced official patch?

And if I install the unofficial one, can I install the official one over the previous when it comes out?

Go ahead and install it! It doesn't do anything -permanent- to your installation of ToEE and we have nicely included an uninstaller program for the unofficial patch. Be sure to run it before you install the official patch (whenever that is released). You should be fine.