https://twitter.com/toei_rider_ZIO/status/1340454387873931267

"Kamen Rider Zi-O vs. Decade: 7 Zi-O" & "Kamen Rider Decade vs. Zi-O: Decade's Death Game" announced for Feb. 2nd, 2021 on TTFC. Satoshi Morota will be directing, and Toshiki Inoue will be writing.

Can't say I expected this, and it's right in the 50th. They planned this.

Not so hyped about Inoue directing though, as in the wrong hands Tsukasa can be done so very wrong.

Wonder what might happen there?

I wonder if this take place after Geiz Majesty? And also will we be able to see Decade’s new K touch with all of the Heisei Riders and a new Complete form? And are they going to be two version of it?

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From the looks of it, Decade will get a new Complete Form.
Apparently including Zero-One as well.
While Zi-O gets a Ridewatch of Saver and uses it in tandem with the DecadeArmor form