I've been wondering lately of when the R15 animations will be released. Even on how can you switch into R15 when it is soon released. Can someone tell me answers to this and I will find out soon.
The exact date of the R15 release is unknown, but you can find an R15 plugin in the Develop menu. I use it here; https://www.roblox.com/games/424318245/Cozy-House-R15-Test
As for how to switch to R15 when it's released, there should be a switch on the Configure menu.