Until now the creators of bitcoin are very mysterious and I also believe that they will go back and develop their creations but I think they will keep their identities hidden.

it is not bitcoin creators, it is creator. it goes by the name "Satoshi Nakamoto" which may be a group of developers but unless you have some proof it is one person.
and i don't believe Satoshi is coming back. he went away for a reason and because of that reason he won't come back.

as far as I know, no one actually know who created bitcoin. I think the creator of it would not want to reveal himself.

Nobody met Satoshi in person after he first declared the whitepaper and started running the network along with the late Hal Finney. There was a time when media tried really hard and a lot of people were called Satoshi Nakamoto at various times.

Some believe it was a group of people or even state actors. Conspiracy theories can also be found regarding it all being a big plan. Whatever it was, it was a gift from the man/ group/ organization to the world. It is one of the awesome things about bitcoin that there is no figurehead but just a legend that lives on!

For an idea of what the man said, this link of quotes from Satoshi with sources is highly recommended.