We're currently "testing it"   .

mtrlt is on his own when it comes to releasing it publicly, v13 of Reaper also includes many other benefits many people have been waiting for (makes SC hash about 60% faster on CPU). He may never release it publicly, keep an eye on the SC forum or wiki, if it does get released it will be mentioned there first. Given how easy it is to actually do it if you're a good programmer I'm sure others will attempt it regardless.
...