Yes. The harder difficulty mode (which will include changes to enemy placement, composition and AI, rather than just the modifiers to Chance to Hit and Vitality in the current difficulty settings) was mentioned before in the forum, etc, but wasn't part of the Enhanced Edition announcement (it is one of the gameplay modes mentioned but not described). It will be officially announced when there are more details to be revealed. Game balance will be looked at in general, as well.
Great news, since the difficulty mods I've found, while noble efforts, haven't fully satisfied! Thanks very much for confirming, Raze. (Apologies if I missed the earlier detailing of it -- I thought I'd read the entire thread.)
And thanks again for your continued, tireless, patient support on these forums. The reliable info and straight answers are much appreciated.