According to Mobile Review’s Forum there is a device in the pipeline called the Nokia N78, it will be a replacement for the N73, with WiFi, 3.2 megapixel camera, 369 MHz processor (same as the Nokia 6290) and what makes it special is the fact that it will be the first device running S60 3rd Edition Feature Pack 2 on the market. If it is supposed to be available in 1H 2008, expect for it to be announced either at CES or 3GSM.
The Nokia N73 is the most successful S60 device … ever, so the N78 has some big shoes to fill.