You should be getting the update very soon......
Some X devices in Europe have got the update, just none in the UK afaik.
TBH though, the update is going to be worth the wait, especially for the X. HTC are doing more than just providing the new android jellybean features, they are also improving sense even further i.e. the camera app UI as well as quality, UI tweaks to the battery info. section, task manager, gallery, SMS app, browser, keyboard and have USB OTG amongst other things.
The performance of the X has shot up so high that it evens beats the GS 3 with JB in benchmarks, yet the GS 3 has the better hardware.
Battery life as well as audio quality has supposedly also improved.
What annoys me is the way the X+ has been out for like 2-3 weeks now, which has the same hardware and it comes with JB/sense V4+, HTC could have easily updated the X a week or so before the release of the X+ as JB/sense V4+ will have been ready for quite a while. Exact same is happening with the one S and one SE, which has been released in Taiwan.
But then again Samsung did the exact same with their GS 3 and GS 3 LTE model.
Typical businesses, only care about profits and sales.