I've recently obtained some cool new items from an anonymous friend, this being one of them and the first to see the light of day this December.
Although this was already leaked in August last year (so this technically isn't really a leak per se), the existing copy is missing the setup program itself and only contains the Plus! files, making the installation somewhat impractical. This copy I got is 100% complete and working, tested on Windows 95 RTM.
Download here. See some screenshots here.
Expect more cool stuff by the end of the year, this is just a little tease for what's yet to come.