As for the “hit die” concept, I see this as a good way to model the warlord as a healer. Since he’s not doing anything magical, I see him as allowing people to use their natural resources better. Perhaps he gives a bonus or a bigger die type or just using hit dice during combat. He won’t be as good of a healer as a cleric, but he’ll have other abilities to balance this. Likewise, I see some themes giving a bonus to healing.

As for the modules affecting adventures, I think there will be a standard set of modules for organized play and this will be the baseline most modules will be written around. If enough grognards jump on the 5e bandwagon (which I doubt), then there will probably also be a set of “old school standard options” emerge as well. Sadly, this will probably lead to “civil edition war” as people argue the merits of different combinations.

And bloodied is bloody useful. It’s even easy to import into games that have different kinds of health levels.