No, there's nothing about concealed carry. This was a request not to carry openly. If they were concerned about concealed carry, they'd ban it, which I believe they can do in all states. I suspect it was a reaction to Starbucks Appreciation Day a few weeks ago, you can google it. Gunowners were encouraged to carry openly at their local Starbucks, not a political organization, to thank them for following local laws and not barring firearms. In many regions of the country, I'm not sure that's the best thank you. Here's
one site with a few pics, most of them wouldn't concern me, though I'd certainly notice an open firearm. The support is nice, it's a posed pictured, and I am in no way casting dispersions on an American exercising his rights, but I walk into Starbucks as am confronted by this
depending on body language that is a problem which could unconceal a firearm.
I've no problem with Starbucks essentially requesting but not banning open carry, they're a business which seems to be supportive of gun rights, thus the appreciation day. Harming their business is no way to thank them.