from the stuff that ive seen.. im actually looking forward to DA:I. im probably going to replay the older games again to get the saves and stuff i want.. also to refresh myself on all of the story bits. but here is what i feel will be disliked:
the ending will amount to 3 choices.. good, bad, neutral. the "40 endings" will be nothing more than very minor variations.. the overall storyarch will have little changes. also, all of the decisions you made up to that point.. meaningless. note that this is just a prediction based on their history
the "vast" environments wont really be that "vast".
you wont be able to kill off characters.
you can only have access to 8 abilities at once.
the game will only be around 20 hours or so on average.. not the 50-150 hours that is being advertised... again, basing this off of previous history.
crafting wont really be that useful.. other than the system will get you potions and a few minor upgrades to your armor.