Smoker- df awakening with advanced observation and maybe a tech upgrade to his weapon
Coby- In the bb arc probably
Helmeppo- tech upgrades with haki
Sanji- Did he actually take queen's arm I don't remember? If he did then maybe some info on that and info on lunarian genes other than that I don't think sanji will get a powerup this arc
Actually severely things suggest he is actually getting it. Infact the film red movie even hinted at it. With him being the one to order the strawhats, law and bigmom crew members when luffy wasn't there lol
This sounds plausible, given the description and Odas shenanigans too. I did see people joking on Reddit that Imu might just be a blob character like we've seen, with no actual design and just be a walking silhouette with eyes only, the ultimate "meta joke" on silhouettes and such.
I'd hate that with a passion personally but I know Oda would relish the idea greatly.