My EE-S just shipped today from focusingscreen.com as well. Unfortunately yesterday I sent my Tamron 70-200 and the K-5 body to Tamron for adjustment of the lens. They quoted me three day turnaround for the in-warranty adjustment so hopefully the camera will get back to me shortly after the screen arrives.
Once I try the installation of the screen...if you hear yelling from up north in Minnesota you'll know it's not going well
However, there's so much good info here about it I can't imagine it's a problem? Sounds to me like trying the provided red shim first seems to be the thing to do.