The text of the invite does not give us a lot of clues:
“We still have a lot to cover”
Granted: IPad, Maverick and Mac Pro.
Very likely: Macbook Pro Retina, Mac Mini
Could it be: TB2 Display, Apple TV, IWork
I'm a bit more conservative:
- Mavericks is virtually certain because we know when it was released to GM.
- new iPads seem most likely after Mavericks and the invitation implies a plurality of announcements.
- Mac Pro is the sort of flashy new product that Apple might want to introduce at an event and it's the only Mac which Apple have promised for this year.
- MacBook Pro seems about due because other manufacturers have announced (but are not yet shipping) laptops with the specific Haswell CPUs that we expect Apple to put in the MacBook Pro.
- Mac mini is similarly due for a refresh.
- Apple TV is also due for a refresh, but timing may be driven by contracts for content with resolution above 1080p.
The last three don't seem flashy enough to introduce at an event. I expect them to be updated silently, but if they are coincidently ready at just the right time, they might get a brief mention. Anyway, we'll know a lot more in a week.