Since revert means return back, go back etc., “revert back” may not be grammatically correct. “I will revert to you later” is grammatically correct. But the meaning is not what you think. The meaning is “Sometime later I will become you or change back to you (also implies that sometime back I was you)”.

What does I will revert to you mean?

' He uses it (and claims that his Bahamian/English friends use it) to mean 'to get back to someone. ' That is, instead of saying, 'I will get back to you with that information or with respect to that issue,' they say, 'I will revert to you.

Will revert back to you or revert to you?

The word 'revert' itself means to return to a previous subject or condition, so the insertion of the word 'back' in the sentence is incorrect. The correct thing to say is: ~ "I will revert to you shortly."