A Little Patience and Dagger in the Dark are two scenarios, bought to us by patch 5.1. These scenarios are faction based. A Little Patience is Alliance only and Dagger in the Dark is available only for Horde players.

We ran each of these scenarios to see what are we facing.

A Little Patience
The title it's perfect for this scenario, because not only the story is testing Varian's patience but the player's patience as well.
I'm sure the video will explain everything, but there is something I noticed. The whole scenario seems to be on a timer, but somehow it gets stuck at 1min. I have no idea what will happen if that time runs out... Maybe we'll find that out when 5.1 goes live.
If you don't like spoilers avoid watching this video.

Dagger in the Dark
The horde players will help Vol'jin in this scenario. You'll understand what Mogu were doing, or what they wanted to do, and what Garrosh real plans are.
It is known that Garrosh is the final boss of this expansion, well, this scenario it's just the beginning of the whole plot.
If you don't like spoilers avoid watching this video as well.

Basically these two scenarios are just side stories of what's going on in Krasarang Wilds with Dominance Offensive and Operation: Shieldwall after both Alliance and Horde leaders arrive to Pandaria.