It could also be a play on "revise", as in to do-over/make corrections. Would be quite fitting, for an anniversary year.
Oh, that's right, it's an anniversary. So maybe "revisit" or "review" is where they're going with it -- except they just did that sort of thing with Zi-O three years earlier.
... it would also be fitting if it's good, coming after the lackluster book Rider.
I dunno, I think Saber has gotten better, albeit rather dark. It's not as good as Zero-One was, but it's okay. Although it helps that it has terrific music. Saber's henshin/heroism theme is one of my favorite pieces of tokusatsu music.
So let's see... It's still one more year before we see if they'll actually do Kamen Rider Shinobi as the 2022 series.