The download patch is being sent out. Mine is currently updating. If yours isn't, restart Battle.Net and it should work.
The Halloween special is now live. A new game mode has been added, which appears to be a pure 4 player co-op event, and a bunch of new Halloween cosmetics have been added. There's good and bad with this. The good is that yes, yes.. YES you can buy what you want with in game currency! The bad news is that these things will be more expensive that things in the same level. So for example, Zenyatta has a new skin, but it's at a tier where everything is normally 250, and the Halloween skin is 750. You better hope that you don't find an epic skin that you want, because those normally go for 2000, but here they go to 3000. I really hope I get the luck of the draw with Mercy and Junkrat, and king3pj I think you'll want the Reaper skin (I'll let you see that yourself.) I'm also excited to see what the new game mode entails. I've just been checking on my game remotely from work so I can't actually play... although I'm really tempted to head out of work early to check it out... maybe do a quick match when I get home.. man I really wish I didn't have that exclusive event tonight.. ;p
Looks like someone on Agents of Shield's writing staff is a fan of Junkrat..