The HOX upgrade has been rumoured for a while, it is generally referred to as the HTC One X+, but I have no clue if that is just a name slapped onto it by one journo/blogger that took off or if its an "official" rumour of the name.
If you google around under that name you will see details, here is one I pulled which has benchmarked data which generally turns out to be reliable:
I dont recall where I read about the HTC One S upgrade, it may be getting overlooked because it doesnt really have any competition right now, unlike the HOX which is already struggling to keep up in the two phone race between itself and the S3.
There is also a rumoured 5 inch HTC device on the horizon which has had pictures of it (probably as a rough prototype) leak in the past week. Whether this is the HOX+ or a seperate Note style competitor is just pure speculation right now.