Here's the response I got from Roland US re VS700:
Hello Jason,
We have sent a request for Windows 8 drivers to our corporate Roland, BOSS and Cakewalk headquarters in Japan.
At this time, we do not have any information regarding when they plan to release them.
Sincerely,
Roland US Product Support
M-F 8:30am-5:00pm Pacific Time
323-890-3740 PLEASE DO NOT RESPOND DIRECTLY TO THIS EMAIL.