My thoughts on Bill's blog post...
Delta: Either as in a
river delta, or delta as in the
greek letter delta, which means a multitude of things (in physics/chem, it's normally used to represent a change in a value, i.e. delta T would be change in temperature). Or the GDC just likes messing with us, and Delta has some meaning that I'm not aware of :/
(I'm really inclined to think river delta...River Rage, Delta field, "taking shape"...)
Dinosaurs: Either really old-fashioned things, or we actually have to build bots that fight them. Or, just a random mention of dinosaurs that are coming in for an exhibit or something.