But if that's boba, where is his jetpack?

I doubt it's boba since he isn't in the cast list, but it may be someone similar since the two main villans are those nightsisters? I think, like that ventrus sith from the original clone wars cartoons, and mandalorians who are basically the same as boba fett/jangofett, same armour etc.

Storm troopers look kinda weird now, the helmets are ok but the chest armour looks like cardboard or plastic instead of the shiny fibre glass the original stormtroopers had. The whole look of them reminds me of the peacekeepers from hunger games