Here's a press release from Tori's record label about the new album.
It refers to the album as pop/rock, which to me means it will probably not be a solo piano album, but incorporate other instruments such as guitar and drums. It also says a return to the inspiring and personal music that she is known for. I don't know what that means exactly. But some of her earlier records were more personal and relatable lyrically, whereas recently her lyrics have become more esoteric.