Take a look out the window... can you see the street instead of the side of another building? They may have upgraded you to a Street View instead of a Standard View. Did you have a balcony? Or a couch? Were you on the same floor as the lounge (Executive Floor) with lounge access? All of these could be considered upgrades. While some may be a stretch, especially the views (IMO), these are what pass for upgrades at many properties. I've had my fair share of Suite upgrades, but I've come to expect a partial tree view to be considered an upgrade over a partial brick wall view... funny thing is I rarely open the curtains.