We are working on it but want to ensure we launch with the highest possible performance and quality.
If you find information out of date or want to add some more in-depth explanations, you are very welcome to do the necessary changes after having had a look at our Wiki Style Guide. We have not announced the timeline our support for OpenGL 4.3 yet, although we are also excited about this new version and want to get drivers into the hands of our users. It will show you the OpenGL supported version and all the extensions available.
Whatever version you get, that is what your driver supports. This wiki is community driven, and can be edited by anyone. LibGDX lets you go as low-level as you want, giving you direct access to file systems, input devices, audio devices and OpenGL via a unified OpenGL ES 2.0. In your code, try making a GL 4.3 context.
Welcome to our Wiki, a place for comprehensive documentation on the libGDX API and features.