Just thinking about it.

What if "ZI-O" is in fact "The O" as in "The circle/round shape" ? and that's why he looks like this.

Could also the "code" background theme mean something ? Would "ZI-O" be "The 0" then ? Who would be the 1 then ? (yes I did this one just for the Build pun).

The guys eyes would supposedly have a crown motive according to the original rumor though

Hmm, I guess they are just keeping the silhouette on this particular flyer ambiguous as possible until the time is right for the actual reveal.

Traditionally he'll be revealed in Builds after series movie, right?

With the exception of Drive it is the annual tradition by now, so most likely. By Drive I mean Drive was the only rider to not make an appearance prior to his titular show.

I expect that it's the actual silhouette. There was an extremely similar image for Build last year, and the silhouette was accurate. It's possible that they opted for a relatively sleek design. That the Driver doesn't protrude horribly from the silhouette might be a good sign.

Looks like a base form. Like Den-O's starting form.

Kind of feels very classic rider but updated in shape too. Especially the helmet has almost an 01 and 02 feel to it, but without the antennae. Kind of like a sleeker more streamlined 01 from his recent movie rebirth.

It's got the W kind of bulbous shoulder pads, and looks like it has the anklets from a lot of designs too, but in a very standard way. Still all small portruding details seem to point to this as a starting base form, and it'll evolve somehow.

I like the way you think!

From the looks of it, looks to be a very basic form.

Remember - Decade used a base black silhouette as well. This could just be to hide his actual silhouette.