Well we have an open Guest WIFI access point, so there should not be any WPA2 keys in use I guess...
(But MERU is kind of special, all AP's are using the same BSSID for example..)
As I understand MERU has some kind of workaround ongoing, that is currently beeing tested/deployed at other customers.
But what I understand from all reporing in this forum, it's not a specific Meru issue, as other vendors also see issues with iOS9 and especially with WPA2-Enterprise or Hidden ESSID. (That's why I think this problem belongs to Apple, I might be wrong.)
So we will simply wait some time to see how the Meru workaround will work for other customers and if Apple might have some kind of fix coming up, before implementing any changes in our infrastructure for all users. (Not that many complaints at the moment, but the most users use older iPhone models 'not affected' and Android devices that's still works fine.)
However it would be very interesting to know if Apple do accknowledge that there are an issue with WIFI in iOS9 and some of the iPhone models.
Then we could plan accordingly for fixes that's needed or not.
I had a call to Apple support, but sadly they was not able to confirm if there is an issue or not.
So maybe we just have to wait and see what path to chose in the upcoming weeks.
(Guess the iPhone users experience this issue will use the 4G network instead.)
/J