[Sunred]

Personal theory about the four forms for now (which I'm mostly on board with Frontier regarding how they might work in the show):

Physicam Stream: The initial "Au naturel" form good with hand-to-hand combat, the Kuuga Mighty/Kiva Kiva Form of the show.

Technolom Stream: The weapons specialist form, personally I'm thinking this will likely be the form Zeztz takes on when he wants to go trigger-happy.

Esprim Recovery: Assuming Esprim is a bastardization of the word esprit, this to me seems like a tanky form that can take a bazooka blast to the face and would keep on going as it heals quickly like Wolverine or Sabretooth from the X-Men.

Paradigm Wonder: Like Frontier speculated, maybe a Gamma Future-like form, or any of Kamen Rider Double's three forms that involves the Luna Gaia Memory. The "trickster" form for a lack of better words, I guess.

Off topic, props in advance to any grown-up who can manage to put on the Zeztz Driver and won't wait for a memorial edition or CSM. The straps look to be the same ol' plastic straps.