The featurette, via ComingSoon.net, focuses on discussion of how the film fits into the larger Bourne canon.
"We wanted to create a larger conspiracy," Gilroy explains. "The Treadstone programme that you saw was only one programme [of many]."
Renner also discusses his relationship with Weisz's character Marta.
"Aaron needs Marta to survive," Renner explains. "And they're trying to kill her as well."
"There really is no-one else to turn to, they end up completely reliant on one another," Weisz adds.
> Matt Damon won't star in next 'Bourne' film, says exec
> Jeremy Renner gives Rachel Weisz a ride in new 'Bourne Legacy' video
The Bourne Legacy will be released on August 10 in the US and August 13 in the UK. Watch a clip below: