Just for info:
Got my Spica today (unbranded from Amazon.de), came with 1.5, I simply used the current version of NPS from the German Samsung website to upgrade it from a 32bit Win XP notebook.
Did take several attempts (including the upgrade freezing seemingly in the middle of the process, telling me, that I had to do an emergency recovery procedure, which, as it turned out, I didn't need, and including a lot of sweating, swearing, panic attacks...) and so on. The NPS is horrible, I gets server timeouts while downloading the binaries all the time, it is slow, badly designed, puts a gazillion entries into the list of installed software and so on...
Long story short: after several attempts, it suddenly worked, went through smoothly, whole process then took only about 10min and I now have a nice 2.1-update1 (XXJCB) which is so far running without problems.
Might be old news by now, in that case see it as just another confirmation that it actually does work through the official process now, though not in smooth war
.