OK, the new law that allows for concealed carry in establishments that serve alcohol for on-site consumption is now posted on the Arizona Legislative website. Note that it doesn't go into effect until Wednesday, 30 September:
This finally answers the question of where the signs need to be posted. So the sign on the door is valid, but they also need a sign next to the liquor license. Note, that if a sign isn't on the door, it's still your responsibility to ascertain whether carry is permitted or not, per section F(2).
Also note that 2(A) changes things slightly from what they are now. Previously (well, currently as of today), you had to know that it was a place that served and that, therefore, it was illegal to carry there. Thus, you sort of got a free pass: "I didn't know this Denny's served beer...sorry."
Now, it's an affirmative defense to carry where you didn't know it was illegal. This means that you are essentially guilty of committing the crime, and therefore have to admit it in order to say "...but, your Honor, I didn't know it was illegal." This is similar to the self-defense laws before they were recently changed. Before, you had to admit killing the person, then say, "but it was justified because...". Now, it's back where it should be...state has to prove the crime.
Only time will tell how this change in the intent will practically affect things "on the street." But now that the law has been posted, we now know what the governor actually signed.
4-229. Licenses; handguns; posting of notice
A. A person with a permit issued pursuant to section 13-3112 or who meets the criteria specified in section 13-3102, subsection D, paragraph 1 or 2 may carry a concealed handgun on the premises of a licensee who is an on-sale retailer unless the licensee posts a sign that clearly prohibits the possession of weapons on the licensed premises. The sign shall conform to the following requirements:
1. Be posted in a conspicuous location accessible to the general public and immediately adjacent to the liquor license posted on the licensed premises.
2. Contain a pictogram that shows a firearm within a red circle and a diagonal red line across the firearm.
3. Contain the words, "no firearms allowed pursuant to A.R.S. section 4-229".
B. A person shall not carry a firearm on the licensed premises of an on-sale retailer if the licensee has posted the notice prescribed in subsection A of this section.
C. It is an affirmative defense to a violation of subsection B of this section if:
1. The person was not informed of the notice prescribed in subsection A of this section prior to the violation.
2. Any one or more of the following applies:
(a) At the time of the violation the notice prescribed in subsection A of this section had fallen down.
(b) At the time of the violation the person was not a resident of this state.
(c) The licensee had posted the notice prescribed in subsection A of this section not more than thirty days prior to the violation.
D. The department of liquor licenses and control shall prepare the signs required by this section and make them available at no cost to licensees.
E. The signs required by this section shall be composed of block, capital letters printed in black on white laminated paper at a minimum weight of one hundred ten pound index. The lettering and pictogram shall consume a space at least six inches by nine inches. The letters comprising the words "no firearms allowed" shall be at least three-fourths of a vertical inch and all other letters shall be at least one-half of a vertical inch.
F. This section does not prohibit a person who possesses a handgun from entering the licensed premises for a limited time for the specific purpose of either:
1. Seeking emergency aid.
2. Determining whether a sign has been posted pursuant to subsection A of this section.