I would put down a couple of bucks that they'll do a surprise announcement this GenCon, with a playable demo. If it didn't happen this year, then I would guess we'll have to wait another year, since they love GenCon for that stuff.
But this year would be great. It would be the year of L5R, capitalizing on the release of the LCG. At the very least they already have an idea of what they'll be doing with the system.