Apple held a small press conference announcing Mac OS X and that there would be downloadable OS X versions of iTunes, iMovie 2, and a preview of Appleworks 6.1 come this Sat.
Many Mac users report being able to snag a copy of Mac OS X at their local Staples. You might have to ask for them to look for it "in the back"...
Oh, and to end the ongoing debate... OS X does appear to be build 4k78.