They range from simple desktop enhancements to the latest version of AOL's Instant Messenger. The majors will take a while to get their work done, however. More to the point, when those programs are released, you can expect to pay standard upgrade fees to get them. Publishers will incorporate new features to justify the money, but there will be no free ride. Then again, these new releases would likely come anyway.
Publishers get a huge portion of their income from repeat customers.
The big question mark in all this, though, is whether Mac OS X is sufficient to take Apple out of the single digits in market share. It's a hard road out there, where perennial upstart Apple continues to fight for every sale in a Windows world. Apple's initial prediction is that that they will be the number one supplier of Unix-based operating systems by the end of the year. They're banking on the industrial strength capabilities of Mac OS X to get them some presence in the business market, an area where Apple has failed to make significant inroads. Well even if Mac OS X doesn't raise Apple's market share very much, it's going to be talked about and debated for years to come.