As you might know, we unfortunately didn't get a KyuRanger VS Zyuohger movie (some saying it's because of Tusk's actor in a bike accident), but I think there's a bigger reason behind it, maybe a big 4-team team-up between the KyuRangers, the Zyuohgers, and the current teams, LupinRanger and PatRanger.
LupinRanger VS PatRanger VS KyuRanger VS Zyuohger
All members of the 4 teams will be included, including Bud.
I also want to set up a friendship of Umika/Lupin Yellow and Amu/Zyuoh Tiger, cause I think it could work (not to mention, both of their actresses are named Haruka)
There will be a cameo by the next Sentai, which I think is
GATTAI SENTAI MUGENGER
Mugenger can switch to 10 forms (1/2 for both genders)
[Edit: the offical Sentai name has been revealed to be Kishiryu Sentai Ryuusoger, so I geuss a cameo for them instead]
GokaiRed, AkaRenger, AkaRed and DekaRed appear to give some legacy words to the Kyu, Lupin and PatRangers and give the KyuRangers a gadget to travel dimensions.
2 Noels will be in the fight, due to Kyutama cloning.
An big mecha of all their mechas used through a Cube-tama (based on this fan art I saw once).
The ending dance will be either Kyutama Dance then Zyuoh Dance or a mix of both and what not.
A little Amu ship thing at the end, either Yamato or Tusk with either 3 endings:
1. The guy proposes to Amu
2. Amu is pregnant
3. Uncle Mario arrives with their kids.
The main enemy is Gin Amis (a mix of Ginis from Zyuohger and Don Armage from KyuRanger)
If you want to see this stuff, check out my story as MisterOrange2 on WattPad.