When you are “keeping someone posted about something,” you are providing them with constant updates and new information regarding said matter. You will usually use this expression when referring to a changing or developing situation, one that requires attention and vigilance.

Will keep you posted or will keep you updated?

The speaker just wants you to give him regular updates on what is going on. If someone asks you to keep them posted on the general progress of a project, you may want to say, “Ok. I'll keep you updated.” Alternatively, if they are waiting for some specific information you can say, “Ok.

Will you keep me posted meaning?

Meaning of Keep me posted

This is a common and useful English expression. If you keep someone posted it means that you continue to give them the latest information about something. // They made me promise to keep them posted on any developments. // I'll keep you posted on the situation.