There are problems booking WT+ travel while they're switching the fare codes around. See thread below:

http://www.flyertalk.com/forum/Forum15/HTML/005170.html

As for 'enhancements', what they mean is they are setting up new fare codes, with which they will provide us a better product.

A prize for anyone who can figure out exactly how this makes things better for the users, rather than for the airline.