I don’t think this game will involve the Hussite war, but if this game is successful, they might just make a sequel which takes place ~15 years later where you can either help the Hussites or fight against them. At least in the beginning of the Hussite Wars, since they lasted for 15 years, and that would be a kind of long time span to cover in an story (unless time jumps forward in the story till the wars end, and Henry would be 50-something, if he’d be 20 now.) Anyways, in the beginning of this game,which may be divided in acts as well, you could/would/should be the same guy Henry, but 15 years older and wiser. He might be some important person now, in support of either Sigismund or Wenceslaus, depending on your actions in the previous game (I don’t know if we’ll be able to affect the story in that way as to support either brother in the conflict.)
I’m not so knowledgable when it comes to the Hussites or Czech history overall, but whether you’d support Wenceslaus or Sigismund in ‘Deliverance’, you’d still have to be against the Hussites, right? If at the end of ‘Deliverance’ you’re a close ally to either brother, supporting the Hussites ~15 years later would be a kind of betrayal to them… but a lot can happen to change your mind in ~15 years - one of those things would be to see Jan Huss burn at the stake. This event could be the prologue of the game (or Act I of the game even) in which you would decide if your character Henry are in support of Jan Hus’ ideas or not. Of course, that and other things is what would lead you away from Sigismund and/or Wenceslaus, and more towards the Hussite movement and Jan Žižka as their one-eyed leader (and later their zero-eyed leader.) Their battles where they used handgonnes and war wagons would be very interesting to see.