I'm with VFX on this. I've said it before and I think it's worth reiterating here: global illumination is a blanket term for various lighting technologies, but more recently used to refer to indirect illumination, real-time radiosity, color bleeding, etc. I've never seen GI being talked about in the same way by the DC developers; it's always spoken in the context of the game's dynamic time of day feature being able to casts accurate lighting and shadows. If someone could point out otherwise, that'd be greatly appreciated.
And I feel that GI is best illustrated under bright midday settings (in DC, everything in shadows during the day take a cooler hue so its no surprise the overall tone in that DC gif is blue-ish) I've been playing around quite a bit with the demo and the environmental lighting don't exhibit GI the same way AC:U or The Division does...the latter being another
great implementation of GI and it's pretty clear DC is missing that feature (a timelapse DC video shows what I mean:
https://www.youtube.com/watch?v=2qpLCUA_1Ko)