A public beta for an all-new user interface for Steam, Valve's digital distribution program, is now available to all users through the beta opt-in setting inside of Steam. If you have Steam installed, click here to opt-in.nope
In the press release, John Cook, director of Steam development, released the following statement:
We made hundreds of changes to the Steam client as a result of customer feedback on the interface, performance, and functionality. For example, we swapped out the Internet Explorer rendering engine with WebKit, which gives us a bunch of size, stability and performance benefits. This release of Steam leaves us well prepared for another year of strong growth.
A full rundown of the new features in this beta can be found at the Steam website.