Laticrete 125 (the adhesive you can mix with water) is new for 2010. It will probably be less expensive than the version with the additive. They seem to be marketing it towards the condo market - floors with gypsum underlayments.
There is another product called Sonogrip. See
www.sonogrip.com Again, I have never used these types of products because I'm sceptical of pre-mixed adhesives.
Rob, did you use 125 on a job? How did it turn out? Any call backs?