Looks as if the radiator has gotten bigger AGAIN. The radiator "wingspan" seems to slope down more from the centreline than in previous models: maybe the radiators are now so wide they couldn't fit into the loading gauge at the old angle? And, at least on the right-hand side of the unit, it looks as if there is a lot more air intake area for the radiator compartment.
It appears that the other new equipment is mounted ABOVE the engine-- the engine caused to be lower than the auxiliaries/central air/d.b. cab, and now it is higher. Some form of exhaust treatment (catalytic convertor?) maybe?
The overall length of the unit, however, may not have increased: it may be on the same frame as earlier ES44, not on the longer one used on the AC60CW (and the 4400 hp units built with extra-large radiators for Western Australian service).
Note that the article talks about a plan for 30 service-test units. As with the Evolution Series istself, GE obviously wants all the bugs worked out before the new design is legally required!
(Thanks everybody who posted pics and links!)