If your strategy guide shows you where to find certain party members, items or whatever... those should still be there.
Team suggestions and battle strategies may be outdated, as there are now extra spells, items, classes and party members to consider (Not to mention, new enemies and areas). There are game mechanics changes too, such as not being able to change armour during combat. --- No one, not even a demon, can deny a man his Pizza Shack Teriyaki Pizza.
Only differences to the game are the new companions and their related quest. All other content is the same.
The Black Pit exist outside of the game, which is kind of a shame. I would have liked it to have been ingame with rewards that you could take out if you complete it. --- Your words are choked in cobwebs of ignorance or inexperience, and there is no harm in brushing such things away. Steam: Silvak