So, first of all. Instead of just appearing at the front door, you ride in the back of this armoured car. It drives you up to the door and you jump out the back. Just a little visual flair to start a mission off.
Secondly, you select your gear once you've pulled up to the mission rather than before, again just more for flow than anything. This screen is highly WIP, redesigning it currently.
Finally, an idea I've been toying around with is having different characters for different levels. So, for assault flavoured missions you're a two man team that can choose between hard-hitting weapons. For covert missions, like hostage rescue, you play as a solo agent with silenced weapons.
Oh! I almost forgot, I've got it setup now so you can zoom in and out the game view. In case you find you're squinting, or you want more of an overview.