Yes - Stickers = Electronic Upgrades = Elite Upgrade
But the historical nomenclature of "Stickers" lives on.
I miss the old stickers. I actually carry my own now and apply them to my boarding pass. I've got little smiley face ones that look like this --

. I use blue ones to represent 1,000 mile segments and red ones for 500 mile segments. I think the GAs who take my boarding pass really appreciate the gesture, although I've learned not to obstruct the bar code, cause that really pisses them off.