From an end-user perspective, this is one of the MUST HAVE developments on my list. VERY exciting news!!! Java on the N800 will open up all SORTS of goodness!
Well the answer is probably "we're waiting for Nokia to release a software update including a recent version of GTK". The basic JVM has been running on the N800 for a while. How far they're planning to go in Hildon-ising it beyond a basic GTK version is another question.