My experience was that even back in late April, most of the outdoor FSE area (I didn't try any further down than the D) had free wifi. This was from the Plaza to the D. I have seen posts from people saying free wifi doesn't exist because they can't get it in their tower hotel rooms. Well that is not the intention of this, to have free wifi for hotel rooms, and I doubt it will be coming there. It's for the public out IN the city to be able to use free wifi. The signal strength even deep in some of the casinos was not strong enough to use, and surely most of the hotel rooms were out of range. They are not going to be installing access points in the Golden Nugget, for example, to pipe in free wifi into a private hotel.
The only downsides I observed was that every damn time you reconnected, even 15 minutes later, you had to agree to their terms and conditions before browsing, and that the SSID varied for each access point as you traveled down the FSE.
As I read these posts, months later, I keep wondering, why isn't anyone else mentioning they used the free wifi? I used it for several days and several locations under the FSE. The only explanation I can think of, is that this was some kind of trial for LV.net to show the city how it would work/look, and that it is not turned on anymore? On the the other hand, as I said, all the reports I see talk about "can't get it in the rooms", "can't get it near El Cortez", etc, but never seeming to say they tried in outside under the FSE.

Connected to one of the several free wifi SSID's out on the FSE. LV.net is the provider that the city chose.