So.... 5 bucks to have the option "not to kill the bosses?" or am i miassing something? a Link?
Here are some of the changes and improvements that I can thing of off the top of my head:
The "Missing Link" DLC is integrated into the game, and no longer stand alone.
The Boss fights are better. You still have to kill them (for story purposes), but you can now do it in different ways (via hacking, Stealth, etc). The Boss fight environments have been improved as well.
I've heard you can now throw back enemy grenades, but I have not confirmed it.
I didnt really like this game to be honest and no DLC is going to save it. The cut scenes were spectacular but the gameplay looked like it could have been done on the quake 3 engine. Plus by the end of the game my guy was so over powered that the last boss was childsplay... Nice story though.