Pretty skeptical about the whole addition of adjectives. The breadth of objects wasn't my beef with the first game, it was the actual functionality and controlling of the objects. Having adjectives seems like it might stunt the player's creativity, like how many players used the jetpack for everything in the first game. For example, instead of thinking of a heavy object to weigh something down, you could just make any object heavy with that adjective. While it might seem novel to solve everything in the game with a cow, I could see the addition of this concept making the game less fun in the long run. However, you could argue that it's up the player to choose to use creative items.
While 5th Cell claims that they'll fix all the issues from the first game, I feel that they should perfect or at least polish their existing formula before trying to iterate with ideas that could make the game more complex. If they can do this, great. I do understand that their sequel needs a "hook," much like the first game, and at face value, adjectives seem to be a very compelling addition.