Vancouver's VanCity Buzz (reliable news source) is saying that the sequel to Disney's 2010 TRON: LEGACY will begin lensing in the city October 5.
From VanCity: A majority of Tron: Legacy was shot at Canadian Motion Picture Park in Burnaby while some ‘real world’ scenes were filmed at the Shangri-La Vancouver Hotel (ENCOM headquarters), the Lions Gate Bridge (final escape scene) and neighbourhoods in East Vancouver.
It appears that lead Garrett Hedlund and director Joseph Kosinski WILL return according to rumors.
I've lived in Vancouver and LOVE it. I'll update you on locations for TRON 3 as soon as I have them. No word on whether TRON 3 will continue in the fine tradition of TRON: LEGACY's native 3D, which in my mind absolutely demands it.