My thoughts from the previews so far
Witcher 3 with it's expansions to this day is still one of my favorite games of all time. I have played it for hundreds of hours. The best side quests in any game ever, incredible musical score, art direction, world design, enemy variety, writing, characters and even though the melee combat was subpar even back then (don't forget at the time of Witcher's 3 release we didn't have many great third person over the shoulder melee combat in games however there were still exceptions like Bloodborne, Middle Earth Shadow of Mordor e.t.c) the devs team still found ways to approach the combat in interesting ways like different oils, bombs, potions, signs, swords, decoctions depending on the monster and enemy you faced. I explained all that because the game is being developed by the old og Witcher 3 team. I will now express my concerns for Blood of Danwalker from the previews and what things i found interesting but also what things can be improved further even though some are more difficult to change at the end of development.
First of all the game has an interesting mix of the medieval era and vampirism which i find very interesting to explore because most vampire projects we see are mainly focused on gothic or pure fantasy or Victorian settings. Also each of the main villains has this unique backstory and them each been from a totally different era and civilization makes this very interesting. The time limit thing i think if it is implemented correctly it can work for the game very well so we will wait and see about this. I believe the side quests and writing will be strong based from what we have seen and the game being developed by the Witcher 3 devs. Also world building and exploration so far hasn't caught my eye too much like the Witcher 3 and i feel like one of the reasons is that this game is somewhat less focused on fantasy so variety in encounters and exploration in different regions could be a bit limited. I want to see more in terms of meaningful loot and gear progression. Witcher 3 had an interesting and progressive gear and loot system. UI and inventory seems very similar to Witcher 3 and it's ok i guess. I didn't mind the UI and inventory of Witcher 3 and the later patches of the game had improved it a lot. As for Blood of the Dawnwalker the UI on the game when playing the game (not managing and opening the inventory and map) like when you fight, i think it needs a bit of improvement. For example the bars of the enemies health and the status effects can be improved because right now they feel a bit "arcady" if you know what i mean. The map itself when you open it, feels and looks great and the points of interest i don't mind them personally but either i like them. I am sure the musical score will be very good and already has this same Witcher 3 vibe but i want to hear some new compositions too because if it is identical it will not have something to stand out. The use of U5 Engine as for the art direction feels very well implemented and it doesn't look the same as 90% of the games. I think the devs put some of their own spin on it to distinct it from almost all games that look kinda the same using it and that's a good thing.
My main concern for the game so far is the combat, rpg elements and progression. We had a good glimpse of the skill tree showing the stats and skills you can unlock and improve based on xp points and i must say am a bit disappointment from what i saw. The only drawback for the Witcher 3 for me was the melee sword combat and the skill tree that most of the upgrades were straight up meaningless stat grinding with basic numbers going up like +10% that plus that (like for crit damage for example) 20% the other (for bleed damage for example) and so on. I believe a game is more interesting when it finds better ways to approach the skill tree progression like new abilities either with different sword melee combat moves, different movesets or casting new spells and magic as well as defensive mechanics. The second main point of my concern of the game aside from the skill tree as i mentioned just before is the melee sword combat. The games have evolved with time so much that many games now offer incredible fluid combat while keeping it grounded and offering different ways to approach it based on movesets or skills. I feel like the only criticism from players for the Witcher 3 was of this exact reason and the devs could and should improve this in this game.
So to sum it up for the positives, i have faith in the devs based from what we have seen and their skill in creating interesting stories, quests, great writing, world exploration, musical score and art direction but the main weakness so far from the game from what i have seen is the melee combat, skill system and progression as well as i need to see more on the loot and gear system. UI can be also improved especially in battle encounters.