After reviewing the article regarding kb951126, I see file information regarding SP3 has a build number of 5.1.2600.5573. Will 5573 be the build version for SP3 Final? http://support.microsoft.com/kb/951126/
KB951126 is a Hot Fix for a specific problem and the 5573 is specific to those files in this Hot Fix. If you look at other previous Hot Fixes you will see it is the norm to assign a 'build' number to the specific files involved so that one can identify which version of the file one currently has on his/her computer. There is usually no relationship to a Beta Service Pack and its progress. Primarily it would indicate that the SP3 RTM will probably have a build number less than 5573.
I also find interesting the 3344 sp2 information. My poor build is 2180 at the very end. Hmmmm I really am outta date until the final SP3 becomes gold. *Gasp * Lions tigers and viruses oh my
KB951126 is a Hot Fix for a specific problem and the 5573 is specific to those files in this Hot Fix. If you look at other previous Hot Fixes you will see it is the norm to assign a 'build' number to the specific files involved so that one can identify which version of the file one currently has on his/her computer. There is usually no relationship to a Beta Service Pack and its progress. Primarily it would indicate that the SP3 RTM will probably have a build number less than 5573.