The VS700 works great with 8.5.3. I think there are many problems going with it's availability. It's not a matter of integration with X1. Those problems can and I think will be fixed by the guys at Cakewalk. As to whether or not Roland is still supporting it, that's where the problems come in. You must remember that Japan is in a very dire situation due to the nuclear plant meltdown and tsunami. I'm sure they are having problems producing certain things. Things leaving Japan are subject to checks for radiation. At this point in time, the aftereffects of radiation contamination have spread due to weather, ocean tides, people moving, things moving, etc. Irradiation is a long term problem that spreads and changes and gets into all kinds of materials that are neccesary to make technological-electronic machines. Mostly, conductive metals can attract and retain radioactivity and become subject to the decay caused by irradiation. Don't ask me for facts on this, I don't have any stats. Just remember, the place where the VS700 is made is in Japan, and Japan is suffering through a huge crisis with an uncertain future.
Add to that the economy meltdown and the marketing bean counters and a perfectly good peice of equipment may get sidelined.