ScottR wrote:If it takes another 4-5 years to finish the next project, that could potentially be a 9 year drought.
Obviously, I cannot accept the premise of your statement.

Besides, you failed to mention "When Loud Weather Buffeted Naoshima" which followed Nine Horses' Money For All in 2007...so that was yet another project issued only two years ago.
As for the future, it looks promising that there will indeed be a release of the material for the installation When We Return You Won't Recognise Us, either for purchase on compact disc or available as a download. So in all likelihood, we will have a new release from Sylvian at some point next year.
I have been informed that Samadhi Sound plans on releasing a good deal of product from various artists in the forthcoming year, though I haven't learned of the details yet.
Steve Jansen is also working on material, which most likely will be his second solo album on Samadhi. Sylvian may be involved in some capacity. Yet if he is strongly inspired by the material, then there is a slight chance it could possibly evolve into a Nine Horses release.
That is where things stand right now.