I could see it going either way. The interesting thing about this Watch event is how different it is from a normal Apple announcement. They've had to link in all sorts of other advertising such as the pop-up stores and magazine coverage, showing the involvement of a whole lot of new people used to jewellery/fashion and that kind of thing.
There will presumably be a stack of journos and other invited guests at this event who would never have gone to a normal Apple do. And so it will probably be run quite differently.
On the one hand, you could easily argue that that would be a reason not to show any "tech" stuff and concentrate entirely on the Watch.
On the other hand, if you have a stack of fashion types listening, maybe it wouldn't be a dumb idea to show a sexy new laptop and see whether you can tag that on to the back of the buzz about the watch...
But which hand is the minute hand?