We're still trying to figureoutthedifference between the two models, but our guess is that the 1016P will have 3G, while the 1018P sticks just to WiFi.
When comparing the day-to-day focus on building technical stuff, and the day-to-day reality of trying to figureout current Market Truth, it is really useful to note thedifference in complexity: Engineering is a relatively small challenge in most cases.