Sp2 should be coming soon, beta has been released to a few testers. However there probally is a leaked version which I am not prepared to test at the moment.

From what I have read is that the download will be either 40mb or 60mb depending on architecture. Also Sp1 will be a pre-requistate which is given seeing as though the download for sp2 will be extrmemly small compared to the likes of XP SP3 which is around 300mb if im not mistaken.

http://blogs.technet.com/springboard...ce-pack-2.aspx