How many G episodes are there published and is going to be more?

There is no official "G" anime or series. Could you please clarify what you are referring to?

Perhaps you meant:

* "Gundam" series: There are many different Gundam series, including Mobile Suit Gundam, Gundam Wing, Gundam Seed, etc.

* Another anime or series: Is there a specific show you're thinking of?

Please provide more information so I can assist you better!