the tool is already out, but it's not recommend, because Slipstreaming the Sp2 ONLY works if you have a Original MS DVD with Sp1 included! If you slipstream the Sp1 into a RTM and next Sp2 into the Image you will kill the Image. If you install it, the installation will fail! This is a limitation of the servicing stack and that's the cause why MSFT disabled the slipstreaming option in Windows Vista / Windows 7.