The update for the HTCÂ One X has only hit a handful of countries across Europe. It is safe to say that it should slowly start to make its way to many of the larger markets overseas. When it makes it to the AT&T One X is a question that remains to be seen. Especially since the US carriers are bit more picky and slow at getting things done on anything older, or anything at all.
For those of you who like to play, hit the source link for the thread and a bunch of download links to the update zip.
Source: XDA via Android and Me