It is a relatively new law, or more accuratley, a clarification of an old law.
Texas law states that you may have a firearm in your vehicle "while traveling".
The thing is, that hazy description left a lot of grey area and confusion, because the law said in order to be considered "traveling", you had to be going from one county to another, and you could not be a "salesman" for some reason. There was a lot of room for police to harrass and arrest a person under that old law. There were other quieks in the old law too, and the new law clarified a lot of stuff.
One thing it says plainly is that the firearm must not be concealed in the vehicle. It must be in plain sight. This is not for CCL people, but rather everyone else. I assume a CCL person may conceal their weapon. I do not know what the rules are for a CCL person.
Huh?! Are you talking about Texas?
http://www.legis.state.tx.us/tlodocs/80R/billtext/html/HB01815F.HTM