According to CNN, F&F7 filmmakers have invited his brothers, Caleb and Cody, onto the set to fill gaps in action scenes where Walker's character, Brian O'Connor, should appear. The producers plan to use four body doubles for Walker. In post-production, they will have Walker's face and voice overlaid onto them.
Fast and Furious 7 was originally scheduled for release this summer, but after production was suspended, it was pushed back until April 10, 2015. The script has reportedly been rewritten to give Brian O'Connor a proper sendoff and shooting recently restarted in Abu Dhabi.