Announced on Wednesday by Peter Mulholland was a public Linux beta for The Witcher 2: Assassins of Kings Enhanced Edition. Those owning this game can subscribe to the "linux_public_beta" to try out new improvements to the Linux game port. So far in the first beta revision is multi-monitor support, improved support for gamepads, and improved stability to see less crashing.
The improved stability with less crashing will be beneficial to many Linux gamers, but the performance issues are still being addressed. The Witcher 2 Linux performance has been widely bashed due to its use of the eON compatibility layer for porting the game from Windows to Linux. Mulholland mentioned, "Note that this doesn't yet include any of our DX9 multithread rework, as that's still in progress. We thought we'd put this out here so that we can get some feedback from you guys on what we have done so far, and also show that we really are working on making this port better :)"
More information on this open beta for The Witcher 2 can be found via this Steam Community posting. Hopefully soon enough The Witcher 2 for Linux will be in better standing.