Overwatch Live Gameplay Streams
Today's the big day, our first glance at Overwatch being played live on Twitch! Ellohime and HayliNic streamed the game live from Blizzard HQ along with 10 of Overwatch's developers. We've recapped the stream below which includes notes, screenshots, and at the end, links to the recorded gameplay videos from the broadcasts.

General
No single player campaign.
There are cards displayed at the end of the game displaying who got the best in a certain stat. You can vote for which one should win. These are purely fluff for now.Since the game isn't a deathmatch, they want to highlight how you are helping your team instead of just raw kills on the scoreboard.They would be honored if some of the Overwatch characters showed up in Heroes of the Storm.

Maps
Dorado is a new Payload style map which was revealed today. The object to transport is a truck. Screenshots can be found below.

Beta
They don't know how many people will be invited to Beta.They want enough people to engage with the game and generate enough useful feedback to make the best game possible.Stress tests will be a reduced version of the game but with a ton of people.
Nothing firm about EU beta yet. They are only committed to getting North America up right now.No information on payments will be available today.

Cosmetics
Skins are being considered for inclusion in the game. They are a very popular request.
There is a cosmetic progression system which currently rewards character portraits, different sprays, and skin tints.
Historically, sprays are a way to "tag" the map with a picture / symbol.

Gameplay
There will be in-game emotes for team communication. Hit a button, a menu will pop up, and you'll get options. Ultimate Status and healing requests are a part of this.You don't keep your kill streak when resurrected.

Technical

They're not ready to announce minimum system requirements. They're zeroing in on it, but they still have lots of room for optimizations.
Controller support will be added eventually, but PC experience is the focus right now.Blizzard will host all servers for the game.
They've got through a lot of revisions on the scoreboard.

In-Game Tips
These tips come from balloons which pop up in-game on the right side of your screen when you respawn.

Try to keep a height advantage over Junkrat, he's much less effective if he has to aim up.
Enemy barriers can block the shots from Deadeye.Sometimes it is better to aim at the ground under your target than to attempt a direct hit.Keep moving while McCree is around, or you'll be an easy target for his Peacekeeper.Don't pass up good opportunities to use Barrage while waiting for the "perfect" one.While Molten Core is active, you do not spend scrap to upgrade Turrets or deploy armor packs.Reaper is most effective at very close range. Keep him at a distance.When you are charged with high energy, play aggressively with your now highly damaging particle cannon.

VODS

http://www.twitch.tv/ellohime/v/20807725
http://www.twitch.tv/haylinic/v/20807854