The final release of GLM 0.9.0 is available and you are invited to update your GLM 0.8.X with this new version. However, don't forget that GLM 0.9.0 is not fully backward compatible mainly due to some API simplifications. The main change from Beta 2 is the support of Objective-C++.
The work on GLM 0.9.1 as already started thanks to the contributions of Christoph Schied and Joshua Smith. If everything goes well, it should remove the limitation on half based type component accesses and a much better swizzle operators without name collisions.
Enjoy!