Well i believe that Huxley will come out later then UT3 which is said to be released in 2007-11-15. You might ask why i think so... Because they have the same engine and since Huxley is MMO and UT3 is simply MP and those who like Huxley know that they have same engine they will buy UT3 first to try it out and train before Huxley. Plus if Huxley was released before that it would ruin UT3 since everybody will forget about UT3 and buy Huxley and play it instead. So as i see it it's better for business to release Huxley later, 1-3 month later so that people will buy UT3 without knowing when Huxley is coming out to play it until it does come out and then get the Huxley.
Hope you understand what i mean.