As for me, BD obviously makes more dildos than masturbators and they just released Zoie, so I think it's gonna be a dildo. Now as for what it is specifically there's no way to know for sure, but Bad Dragon tends to take inspiration from whatever is popular, like the Demogorgon being based off... the Demogorgon, from Stranger Things a little while ago. Another example would be Echo, who was released about the same time as Star Wars: The Force Awakens was first shown, and the trailers featured ice planets while Echo is a "Snowstrider", which to me sounds like an alien inhabiting an icy planet.
With all this in mind, I think Bad Dragon is going to base their next dildo off of a creature from the recently released and extremely popular Monster Hunter World. How could they not? It's a popular video game about fighting huge monsters of all different kinds, they could easily spin a story off that about a creature which is being hunted for causing trouble, when really it just wants some "love", if you catch my drift. What exactly? It could be anything really, but if I had to guess they're going to make a dildo based off of the gargantuan monster which is essentially a walking volcano, the Zorah Magdaros.

How exactly it will be shaped is up to the audience they want to reach, but I imagine it's going to be a bit similar to Clayton or Sleipnir in that it will be rough, like a rocky environment along with perhaps some smoother sections like a flow of lava moving down the side of a volcano. I also think it will be on the large side, as the last toy BD released which was particularly big was Axel, and that was quite some time ago.
So, any other ideas on what BD might release next? I'd be very interested in hearing them.