For details, see this post in the client-rewrite thread. This announcement is just to try to get some wider reach for the following question:
Do you require support for OpenGL 2.0 in order to play this game at all?
For the reasons detailed in the linked post (mostly in order to properly support MacOS), I'm strongly considering dropping support for it, so if you are relying on it, you might lose all access to the game. Again, see the linked post for any and all details. Also, please forward this post to anyone you know who could conceivably be affected, since not everyone is reading the forums.
I realize not everyone reading this may be aware of whether they need said support, but if you're using older or odd hardware, or mildly unusual software configurations, you may at least want to try to check. If anyone knows of a good program to help checking, please post all about it.