Typing out detailed feedback in the game takes too long. So, here I am reporting what I have found in my limited playtime thus far. Note: These issues are all NOT related to the older version of the game. All I can say.

Early Game Sniper Mission - Bugs out at the end, repeating the cut scene several times and then locking players in a weird instance for a few minutes before throwing them back into the world to fight the boss.

Lag and latency - Graphics aside, there seems to be a constant low frame rate that gets worse the more players that are around the general area. This issue is by far at its worst during arkfalls, when sound events get meshed together and bug out and mobs (and players) vanish in and out of existence. Other things that are slow to load or vanish: Ground objects, heads of your own player, entire players, guns in player's hands. Sometimes the default player model (bald, male, survivor outfit) will be stuck on toons for a number of seconds until reverting.

Party and grouping issues - Sometimes group members are randomly kicked from the group, or what they see as their group status will be different from what others see. There are a variety of minor bugs that occur when grouping or when using an xbox live party that often require reforming one or both to fix.

End event disconnects - Arkfalls, co-ops, and PVP constantly spawn random disconnects at or near their conclusion. If early enough, these can lead the player to not receiving the "award" (yes, I know awards aren't implemented yet).

Fill in what you have found and I will add it to the list IF it is a problem not related to game version. Devs let me know if I can't do that due to NDA but I think that should be ok.