Yes, Alexa Bliss just announced on her own show that she'd be the host of WrestleMania.
Once the Goddess of WWE began to heap praise on the mysterious host it became pretty obvious that she was actually talking about herself. The former Raw Women's Champion even reverted to heel mode for one of her faux humility bits, which the Pittsburgh crowd seemed to appreciate.
Previous 'Mania host have included Kim Kardashian (yes, really), The Rock and The New Day.
Because we haven't seen Alexa compete in a while there's been speculation that she's injured again, but Bliss herself recently shot down this rumor. We have no idea why she seems to have transitioned into a non-wrestling role, but it may simply be a case of the writers not having a suitable feud for her at the moment.