Sorry, I really looked for this information but found conflicting posts. I haven't played properly since Cata, so I just want to make sure.

• Classic subscription will be included in the current Live Subscription. So you pay $15 (right?) and get access to both Classic and Live servers.

• I heard that WoW base game does not exist anymore, and you just need to buy the latest expansion pack.

• How does this work for Classic? Will I need to buy BFA in order to play on Classic? Or can I simply continue paying $15/month and play Classic?

• Also, I used to have an account for EU. Now that I live in Japan, I think I will play on OC servers. OC servers are considered US servers, correct? Can I add a US subscription to my existing EU account?

You just need a Sub and can play Classic and WoW including Legion.

So if someone want to play Classic and do not have a account he just have to make one and pay 15$ or 13€ for a sub and is ready to go.

hmm, I mean most of us already bought classic already so we should just have an sub.

Classic is its own so it's most likely free, provided by the subscription