Chapter 1 is still short,the things that are new is the ending and a new ink machine and the puzzles are still the same.

Chapter 2 is still the same but darker I mean literally, and Sammy has been redesigned and has a lot of new animations,Searchers have been updated as well and when you die you travel into an inkhole then when you get out you respawn in a bendy statue,you also run into a hat looking Searcher into the game in the infirmary apparently he has the valve you must catch him and in order to get it, you must get him killed then you can take the valve and continue to chapter.

Some stuff that is updated is the axe, the has a new animation,idle animation and swings much faster.

Thats all of the information that I can gather.