Q: Discover Card for Applepay

A software update for Apple Watch (watchOS 2) was originally due to be released yesterday, along with iOS 9.

However, Apple announced a delay in the release. A press statement explained: "We will not release watchOS 2 today but will shortly" due to having "discovered a bug in development of watchOS 2 that is taking a bit longer to fix than we expected".

iOS 9 was released yesterday as planned.

When watchOS 2 is released, you will then be able to update Apple Watch via the Apple Watch app on your iPhone: My Watch > General > Software Update.

That is correct - the ability to add Discover card is mentioned in the preview information for watchOS 2:

http://www.apple.com/watchos-2/

Did you add you Discover to apple watch successfully? I can't add after I updated to OS2

Mine failed on the first try (I think it timed out due to server demand) but I was able to add it on a second attempt with no issues.

Same here. Have tried several times yesterday and again today, but have been unable to add my Discover card.