Shortly following Fido's roll-out of Android 4.1.1 Jelly Bean update for HTC One S, Canadian carrier WIND Mobile made a similar move.
The folks over at MobileSyrup report the upgrade is now live and is pushed OTA (over the air) to HTC One S owners. Keep in mind that due to the fact that it's deployed in waves, it might take a while to reach all devices.
In order to manually pull the update on the phone, HTC One S users should go to Settings / About phone / Software update.
Aside from bringing the phone's software to Android 4.1.1 Jelly Bean, the update also upgrades HTC Sense user interface to version 4+.
Lots of other improvements and bug fixes, as well as a few new features have been also included in the update.