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.