I already have it installed but it is not (yet) the "big" PR-1.1 update. You can see in the build number that it is only two weeks newer than the pre-installed version. Don't expect too many changes. At least the update is really easy and worked for me without a problem
I am not sure why they have released this "old" version instead of releasing the build 51 (PR-1.1). Maybe there are problems and they (Nokia) want to show some support for the community...