Driving past the Edmonton yard (in Strathcona, just south of Whyte Avenue) this evening (14.x.2013), as a VERY freshly painted unit numbered in 5000 range: an SD30ECO, with the big flared radiators as spotting feature I was surer of than I was of the number. Switching, coupled to an older unit.
I managed a closer look at CP 5000 (SD30ECO) a few days ago. It was coupled to an SD40-2 (to form a 6000 hp, 12 axle, switcher set in the Edmonton yards: CP's switching needs have certainly changed since the days when they bought a huge fleet of 660 hp switchers!).
Comparing the two units... There was a difference in cab profile: the outer, sloped, part of the cab roof was not as steep on the new unit as on the old: I assume this gives increased headroom inside the cab.