Also, for anyone curious, the two new enemies I have fought in Revelations so far on Infernal Mode are Black Fenrir and the Wall Blister.
Black Fenrir are like the regular dog Fenrirs, except they are quite a bit bigger, do more damage, have a lot more health, a lot more aggressive, and they have the ability to run away, howl, and call more regular Fenrirs.
Wall Blisters start off in hardened cocoons you can't penetrate that don't hatch until you complete certain story objectives (scripted hatching, not timed). They don't have a lot of health compared to some things on Infernal, but they are fast (they basically dash at you and are about three times as fast as you) and they have a nasty one-hit kill attack they can use when they simply get close to you by catching you in their arms (and they have long arms).