Looks snazzy. Kinda like Zenyatta, but hopefully better. I guess this also pretty much confirms the "Sombra/Ana=Pharah's mother" theory. That's gonna make for some awkward conversations. Poor McCree, not enough that he got nerfed, now he seems to be the team whipping boy 
EDIT:While I can't confirm anything it's now official [https://playoverwatch.com/en-us/heroes/ana/], apparently her abilities go something like this:
LMB & RMB:
Regular shot, heals allies, damages enemies. RMB activates the Scope (duh.)
E: Tranq Dart
Put the target to sleep until they take damage. Seems to be more for escapes than for setting up kills compared to the Flashbang.
Shift: Biotic Grenade
Disables healing for enemies, doubles healing for allies. That ripping noise you just heard was the meta/comp scene getting torn apart.
Ultimate: Nanoboost
Large speed, damage, and defense buffs for one lucky person.
EDIT:
LMB & RMB:
Regular shot, heals allies, damages enemies. RMB activates the Scope (duh.)
E: Tranq Dart
Put the target to sleep until they take damage. Seems to be more for escapes than for setting up kills compared to the Flashbang.
Shift: Biotic Grenade
Disables healing for enemies, doubles healing for allies. That ripping noise you just heard was the meta/comp scene getting torn apart.
Ultimate: Nanoboost
Large speed, damage, and defense buffs for one lucky person.