It's my hope, as rumors have only fueled that hope, that the Fantastic Four will be brought into the MCU universe to fight Thanos, seeing that in the comic book (aka The Infinity Gauntlet), nearly the entire Marvel universe goes to war against Thanos, including various «cosmic»
entities like «Galactus» (which I hope, if in the main
battle, «looks like the
Big G from the comics).
Two of the
biggest battles are about who gets to disburse climate finance (national
entities vs. private banks, multilateral development banks, and large intergovernmental agencies like the FAO) and under what terms (grants vs. loans).