Huffington Post Says

That the Mississippi Open Carry Law is causing confusion. I say Huffpo is causing the confusion.

Confusion over Mississippi's concealed weapons carry laws prompted legislators to address the issue. The law was unclear about whether or not a person carrying a concealed weapon was in violation of the law if the weapon was accidentally exposed to view. House Bill 2 clarifies the issue, stating a gun can be partially exposed if it is in a proper holster, and can be carried openly without a permit.Some have argued that Mississippi was already an open carry gun state and that the law is causing confusion.

So really, the new law just brings open cary back up to top of mind for the residents of the state. No confusion there. 

Go read it (if you care).