Back in March, we announced adding support for Wine as an alternative to Cider, the wrapper used to run the EVE client on OS X. The feedback we have received has been very positive, with most players reporting improved stability and performance.
We are now planning to stop supporting Cider in September, so we encourage everybody that hasn't done so already to switch to Wine. The latest launcher prompts you to make the switch to Wine, making this process quite straight-forward.

What is Wine?
As stated on www.winehq.org Wine is a compatibility layer capable of running Windows application on several POSIX-compliant operating systems, such as Linux, Mac OSX and BSD. Instead of simulating internal Windows logic like a virtual machine or emulator, Wine translates Windows API calls into POSIX calls on-the-fly, eliminating the performance and memory penalties of other methods and allowing you to cleanly integrate Windows applications into your desktop.

Wine options
You shouldn't have to change any Wine options, and these may change at any time as we get feedback.
For now, the main option is what version of Wine should be used - we provide daily builds from the Wine git repository (git://source.winehq.org/git/wine.git). If you select 'Use dev versions' you can choose any of a number of recent daily builds, or to always use the latest one. If you leave the dev versions checkbox unchecked, you can select from stable builds that have had some testing.
The WINEDEBUG field allows you to set a value for the WINEDEBUG environment variable that controls debugging output from Wine. This can be useful for tracking down issues, but should in general be left empty.

What if it doesn't work?
Go to Preferences and select Cider for the wrapper, then everything should work as it did before. Please do tell us about it, either by posting in the feedback thread or by filing a bug report. Our goal is to improve the Mac experience and we need your feedback on this to do that.

EDIT: The last launcher update failed to persist the Wine preference - there is a second update where you may be prompted again - apologies for the inconvenience.