This is apparently an April Fool's Joke from earlier this year.http://tyouhen2.seesaa.net/article/261493397.html
The Planet Iacon facebook page
has shared an image that reveals a new upcoming Transformers line from Takara Tomy, K-On Crossovers! Transformers characters that transform into various musical instruments. The image reveals silhouettes of a guitar, bass guitar, drum set, and key board, along with four robots. The text mentions Optimus Prime, Bumblebee, Ratchet, and Ironhide, but doesn't specify who transformers into what. There will also be an associated anime called Hen-K. Image mirrored below.