Ripped straight from the DF news page:

Client Algorithm Test version

A test version of the client (for Windows and Linux only) will be posted on Thursday, December 4, 2003 in order to test some modifications to the algorithm. The goal for the current protein will be adjusted accordingly, pending the success of the test version. If you are interested in testing the update, please make sure to follow the news closely.

Since we have seen some less than perfect clients in that past (and complained bitterly about them ) it would probably behoove us to do some testing with this client. If you want to, give it a try, then make sure you post any impressions you have about it in the official DF forums.