Thanks to creamhackered at Neowin.net for the info.

A new build of Windows XP SP 2 has escaped - now v1194 and built on the 1st of April - (no April fool). This looks as though it is just an update to 1185 - still just patches and fixes. The rumour now is that SP2 will allow two concurrent RD sessions when using a second generation Smart Display - this will enable a smart display to be used without kicking the current user off of the system.

Windows XP SP2 Build 1194 Screenshot