SP1 seems to be finished. Build number 7601.17514.101119-1850
yes, compilled on November 19. Not officially annouced by MS yet, but this is 99.99% certain
Wave1: Arabic, Bulgarian, Chinese-Hong Kong SAR, Chinese-Simplified, Chinese-Taiwan, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Latvian, Lithuanian, Norwegian, Polish, Portuguese-Brazil, Portuguese-Portugal, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, and Ukrainian.
SIZE: 563,934,504 byte
SIZE: 947,070,088 byte
those that did install it, and everything went smooth you can run this in CMD
dism /online /cleanup-image /spsuperseded
this will remove uninstall files for SP1, and other pre-SP1 updates, to recover quite a bit of HDD space.