If Jabba appears and Greedo is there, I won’t mind too much. Jabba has a lot of Rodians in his employ, so it makes sense he’d be around. Just no random cameos in a crowd like Dr. Evazan and Walrusman had in Rogue One that seemed gratuitous.
Even George cut kid Greedo from TPM.
I really hope Jabba is one of the villains in the movie! If not the main villain then maybe on the side. I’d be interested to see if they built a Jabba puppet again or do part practical-part cgi like they did for the Bor Gullett monster in Rogue One.