There are many phishing emails from "Ebay" doing the rounds. I think you will find Ebay has not sent out a global email at all but implores users to change passwords on their home page. Treat it as rubbish.
Ebay has also said that there is little useful information for hackers in your Ebay account but if you are using the same password for other services the hackers now have your password. It is a great deal more important to change these other passwords.
"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts." - Bertrand Russell
If your actions inspire others to dream more, learn more, do more and become more, you are a leader.-John Q. Adams You must accept one of two basic premises: Either we are alone in the universe, or we are not alone in the universe. And either way, the implications are staggering.-Wernher von Braun Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.-Albert Einstein