GM does a lot of concept crap and get a lot of attention, but I seriously doubt we'll be seeing this in production anytime soon, if ever. Sorry, but their announcements and publicity carries no weight with me; I'll beleive it when I see it.
And if they do end up actually producing those engines, I feel sorry for whoever has to work on them. That belt setup looks like a PITA. And I don't even want to imagine how much you have to disassemble to change the spark plugs. Of course, being a GM engine, they could just put platinums in there and they'll out live the engine. :rofl: