Color809 said that Na-Go was getting an upgrade as well

Yes Nago is supposed to get something but we don't know what it's supposed to be & no on PunkJack, if he does get something it'll probably be after the show in a V-Cinema.

Also apparently there's supposed to be a revised Laser Raise Riser (P-Bandai) that has new sounds, supported by the fact the one of the suit actors posted a photo posing with one that suspiciously has a new card in it (I'm guessing he did this by mistake?).
UPDATE: this updated Laser Raise Riser will include 2 new cards: the Laser King Card & Laser Queen Card

Also Tycoon, Buffa, and Nago's final form items are all P-Bandai.

Looks like Geats IX will have its own exclusive weapon called Geats Buster QB9.

Big update, apparently the current rumor is that Kamen Rider Seeker will be returning very soon to Geats and will be debuting with the Fantasy buckle, later on the Fantasy buckle will go to Nago and serve as her final form (Nago Fantasy is just a recolor of Seeker Fantasy apparently).

Are those just fan art or supposedly leaks?

The drawings are from the same source as the MKIX buckle so those are in the clear, though the art is less certain

Fun fact QB is wordplay for kyubi or nine tales.

And here it is:

Beautiful. Just beautiful.