Actually, it may depend what you want to buy.
I expect that European iPhones will be announced. Look for 3G and more memory as well.
iPods, MBs, MBPs, Minis and iMacs are all up to date.
Mac Pros and ACDs may have a refresh coming, but expect that at the Leopard launch or by November 11 at the latest, at least for the Mac Pros. ACDs actually seem fine as they are.
Other Paris candidates are iPod HiFi (unlikely) and an iPhone Nano (also somewhat unlikely). Aperture could make a visit, but that would be a big surprise.