Elon Musk 's tweet has triggered hashtag # ToyotaNewProductGuesses . It will be revealed at company 's California , Design Studio on April 30 . Launch date coincides with the arrival of Toyota 's new home battery pack . Tesla already uses a fuel cell in its Mirai car that can also power a home .
Elon Musk 's tweet has triggered hashtag # TeslaNewProductGuesses . It will be revealed at company 's California , Design Studio on April 30 . Launch date coincides with the arrival of Tesla 's new home battery pack . Toyota already uses a fuel cell in its Mirai car that can also power a home .