It will almost surely be a Xaku Prime. Xaku is 'Monster of Frankenstein'-like character, amalgam of three lost to the void warframes, wildly remade into Xaku by void energy. It looks like perfect release for Naberus, just like it was the case with Revenant Prime.
I just think they've went into F-M-F-M release cycle, especially when you look at recent warframe releases.
I think the order we will get is: Xaku, Lavos, Yareli, Caliban, Gyre, Styanax (optionally with a swap between Yareli and Gyre in their orders). I do think Styanax will be last from those, just to be 50th Prime release, just like it was with his normal release.
Both Xaku and Lavos are liked enough to not be pushed even further.
The Lavos skip to release his Prime next year, may be because they want to release Deluxe skin for him before priming.
Poor Nikita Leshakov sees his boy being delayed.
