Here's a late breaking hypothesis: the landmark event is not just about the iPhone SDK's GPS hooks, Core Location, and the incredible possibilities they represent. The Snow Leopard OS mystery is about Apple branching off into 2 diverging Major 'desktop' OSes. Leopard for large traditional computers, Snow Leopard for MacBook Air and smaller - like Tablets? Stuff that would run on the Intel Atom.
This makes sense across a lot of lines. Intel Atoms are extremely energy efficient, but they are also underpowered for a desktop OS. Apple could be releasing an Intel Atom optimized version of OSX today.
Or this could all be hooey.What do you think?