One of the questions that has popped up about JavaFX Mobile is "does this replace midlets & xlets"? The answer is "no". It actually supports both midlets and xlets. Midlets were initially designed for the very constrained cellphones of 5 years ago. It has evolved since then and is the volume Java platform today. The next step up are xlets, which are starting to appear on CDC based phones. But the trajectory is clear: these APIs are approaching the full capability of a desktop: JavaSE. As the hardware constraints disappear, the API capabilities step up.

This is one of the great places to apply Moore's law: at any point in time you can look across the axis of scale and turn it on its side: today's high-end is tomorrow's volume.