Valve's announced its to release its new UI update for Steam next Monday, April 26.
"We'd like to extend our thanks to all of you who've taken part in improving Steam by participating in the 2010 Steam UI Update beta," it says. "You've put the beta through its paces and provided great ideas and feedback.
"The beta has been a huge success. The number of you who participated exceeded all our expectations, and so far you've created 25 thousand posts to the beta user forums. As a result of your participation, the Steam team has had the feedback required to make the new Steam client more reliable and useful than ever."
Best get some time on the current Steam and say your goodbyes before Monday, then.