I like how mobile Nemesis seems to be in this game. I thought the Mr. X concept in the RE 2 remake had a lot of potential, but also had problems in its execution. One of those issues was the fact that X was too sluggish and rigid to actually be a threat on his own. It was only when there were other enemies around that he was dangerous, and thus he generally failed to create as much challenge and tension as, say, the Xenomorphs in Isolation (which were fast), since you could usually evade him easily enough so long as you planned your routes properly (or had a line of retreat). I liked that he encouraged planning, but he also encouraged inelegant gameplay (retreating into gamey safe rooms).
Thus I think that Nemesis being faster, more evasive, and having ranged options alone should already make him not only much better than X was in the remake of 2, but also go a long way towards making the "dynamic pursuing boss" mechanic a significant strength of the game. However, the matters of how to incapacitate and how to hide/escape from the pursuing boss still remain, as the handling of these wasn't exactly good in the previous game, though it wasn't quite bad either. I'd like to see some improvements on those fronts too.
I'm relieved to see that Jill looks fine, better than Claire in any case, though not as good as Ada. Even though the Julia Voth version of the character's design (especially in REmake) will always be my favorite, the new version actually looks closer to how she looked in OG RE3.
The only thing that I'm worried about is that the game may be lacking in content. The original wasn't exactly a long game to begin with, and the remake of 2 actually felt shorter than OG RE2 (also thanks to less diverse alternative scenarios). They already have the engine, so I imagine they will put more effort on the content this time around, perhaps flesh out some of the old areas, make them bigger and more complex, perhaps even add new areas (Raccoon City has a lot of potential in this regard). I would not worry about them "ruining" the game with new areas, given that the previous game showed that they understood what made old-school RE level design tick. Of course, that's assuming they can keep up the level of quality they achieved in the RE2 remake. If they do hit that level of quality and the game ends up feeling short again, I think Capcom should just eventually bundle both games together as one game for future releases.