While I found multiple references to "concealed or unconcealed" in the document, the way that Section 1272 Paragraph 3 reads it is illegal for one to "intentionally fail to conceal the handgun" if they have been issued a HWP (and Para 2 makes it illegal to carry a gun w/o a permit). Given the definition of a "concealed handgun" in 1290.2 it would mean that if one were to OC they are "intentionally fail(ing) to conceal the handgun" and are thus violation 1272 para 3. Also "untentional flashing" is a non-issue with OC being legal. Everything else in the bill looks good, but this one paragraph works to undo that which we gained on 1 November.
Also in regards to signs I found this line in Section 1290.22
So they can't simply call the police and hit you with trespass, they still need to ask you to leave....If the person refuses to leave the property and a peace officer is summoned, the person may be issued a citation for an amount not to exceed One Hundred Dollars ($100.00).