I feel like they've announced this several times over already.
Granted, I'm not complaining. I loved Human Revolution, but I will definitely not deny that it was a flawed game and the bosses were absolutely chief among those flaws. I hope they are improving everything in regards to the bosses. The boss battles were not only incredibly limiting, but they seemed pretty contrary to almost every playstyle that was effective during the rest of the game and the boss characters were given no identity and next to no context during the game.
I'm glad they are improving the battles themselves. I can only hope they are putting more effort into the boss characters as well.