I just finished a quest in Western Solstice and had the best time ever!
They added a new stealth mechanic that lets you throw something to distract people in the area at barrels.
The whole quest was awesome. It actually felt like an espionage mission, not only because of the improved stealth, but also because of the nature of the quest and what was done in the process.

I hope to see a bunch more things like that in ESO.
Also, can you update the Thieves Guild and Dark Brotherhood quests to include the new mechanic? That would be awesome!