Blizzard has just detailed the various nerfs and buffs coming to the support class characters in Overwatch. Mercy gets a nerf to her healing beam, Brigette's shield bash has an extended cooldown, while Ana, Moira, and Lúcio all enjoy slight buffs that should see them more involved.
Ana - Nano Boost additionally heals the target instantly for 300 HP.
Brigitte - Shield Bash cooldown increased from 6 to 7 seconds.
Lúcio - Sound Barrier effect increased 50% from 500 to 750 shields (and) Crossfade aura radius increased 20% from 10m to 12m.
Mercy - Primary fire healing beam reduced 17% from 60 HP/s to 50 HP/s.
Moira - Healing resource base regen rate increased 20%.
Blizzard's Geoff Goodman also went into more detail about each character and their reasoning behind the changes. You can read the full post here if you'd like to know why the studio made the tweaks, with the changes "coming to the PTR very soon."