When Mass Effect Legendary Edition is released, it will include all single-player content and DLC from Mass Effect, Mass Effect 2, and Mass Effect 3 remastered for the modern day. BioWare has now gone into detail on the gameplay rebalancing, tuning and mechanical improvements they’ll be implementing into the game.
Combat Tuning
As the series progressed, combat changed throughout the three games. The first game was inspired by traditional RPG mechanics whereas the latter two games’ combat felt more accurate and reliable. The result is the team has made changes to combat within the first game. Accuracy has been improved so firepower is more consistent while still having to monitor shots and the overheat meter. Aiming down sights is more accurate thanks to a tighter camera view, and aim assist is more precise. Some abilities have been rebalanced too, such as Immunity that now provides a limited time powerful defensive buff instead of a permanent smaller buff. These are the main changes made to the first game:
Shepard can now sprint out of combat
Melee attacks are now mapped to a button press rather than automatically occurring based on proximity to an enemy
Weapon accuracy and handling has been significantly improved

Reticle bloom is more controlled
Weapon sway removed from sniper rifles
Aiming down sights/?tight aim? camera view has been improved
Improved aim assist for target acquisition

All relevant enemies now take headshot damage in the first game

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