I did a Darkfall best-case here. Today it’s worst-case time.
Of course the first thing that could go wrong is the game not launching on Nov 20th.
Assuming the game does launch on the 20th, the next issue would be a typically poor MMO launch in terms of queues (over an hour) or outright downtime/crashing. Other problematic issues would be syncing or mobs not spawning ala early DF1.
Moving on, if we have a game on the 20th and we can actually play it, other items of concern are the lack of the first person view (yet to be seen in videos), whether the new role/skill system will move DF too far away from a player-skill based game and closer to a WoW/GW2 skillsmash, and whether the grind to a master-of-all-trades is really gone.
Other concerns include the revamped world (how much smaller? How specialized), the removal of some cities and hamlets (too many for midsized clans to have one?), and whether the economy will be anything but the mess that it was in DF1.
Finally, and most importantly, will DF:UW feel like DF1? Will it really be a better version, or some dumbed-down or bastardized version that is still too hard for ‘casuals’, but not meaty enough for DF1 vets? What if it goes F2P, or sub+cash shop? While it was taken for granted, DF1 remained true to its original version for it’s three year run; will the same happen with DF:UW, or will AV do to it what Blizzard did to WoW with WotLK, or Turbine did to LotRO with F2P? How much would you pay for a hotbar in DF?
(Just kidding about that last one, the game would need to fall really, really far before doing something THAT silly.)