Follow ups to both Outcast and Freelancer would do nicely.
Also, a sequel to Mirrors Edge, preferably with something seperating the free running from the gunplay antics. Something that could be easily done within the context of the story - after all, you've got Faith who could handle all the freerunning and her sister - Kate was it? - who could focus on gunplay.
Why more shooting in a Mirrors Edge game? Because people are too thick to comprehend a first person game where gunning down enemies is not the characters main activity, it seems.