Not sure if this has been found. But the Disney Infinity YouTube confirmed a PC version in 2014. In the comments of the YouTube Video.
SHERIFF: official replies and note that a specific date was never mentioned ...
1st reply ...
Disney Infinity 2 months ago in reply to Emmett Fowler
Hey Emmett, PC players will soon be able to download the free Toy Box app! This is similar to the app that will also be available for iPad, and it allows players to play in the Toy Box with any figures they have bought, as well as create and share Toy Boxes across each version of Disney Infinity that they own! We're looking to make this available as soon as possible - so stay tuned!
2nd reply ...
Disney Infinity 2 months ago
@SuperMarioSonic24 The Toy Box builder app will only be available for the iPad when it launches. Keep an eye out for future devices to be possibly added later.
3rd reply ...
Disney Infinity 1 month ago in reply to Osborn Telly (asking about ipad version)
We don't have an official release date for it yet, but it's coming soon! Stay tuned to our official website for the latest news.