Recently, after the build conference we installed Windows 8 Developer preview edition here. I was checking different components related NFS, IDMU and SUA. While trying to install SUA components I noticed that it is marked as [DEPRECATED].
Looks like we are planning to move away from SUA components. I will get back here once we have some updates on the time frame on this.
BTW, the installation was smooth. There is no SDK released so far, after the installation it will redirect to download the SDK from http://www.microsoft.com/download/en/details.aspx?id=2391 (SUA SDK for Windows 7 / Windows 2008 R2) link.