Process of elimination is that it is an Assassin.
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But hey, Hinako was set to do Rider, and she ended up with Saber when Chaldea fights her (and LB Xiang, who'd be Rider anyway if he wasn't pimped out to be a Berserker-killbot, but whatever), so I expect anything at this point.
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LB5: war being fought, probably between Kirsch's forces and, I'unno, resistance or whatver
LB6: chaos, I expect post-apocalypticpunk but Camelot-flavored, and let's get the Romans in on that action too because yeah
LB7: dunno