Regarding the mech, I was thinking the same thing. I don't want a Fire Mech or Lloyd Mech sized Golden mech. The addition of the Overlord Dragon would be really really nice!
The rumor of the Thunder Raider from Rebooted is also very intriguing. I loved that set and its still one of my prime display pieces.
The 4+ Fire Dragon rumor is a little disheartening, but I'm also not the biggest fan of Dragons. So I'm okay with a small set for the up and coming Ninjago fans.
The Jungle Raider will only be of use if we end up getting any of the last of the Elemental Masters. Will still need Jacob, Bolobo, Gravis, and Chamille. But, I don't see us getting all four in one fail-swoop.
I love that we are getting a Legacy II wave! I feel we may get more in 2021 as it'll will be the 10 year anniversary of the series and will mark the longest in-house IP run in LEGO history (sorry bionicle)