Both the HTC 8X and HTC 8S are on their way to UK carrier O2, according to the "coming soon" section of its website. While no dates for availability are provided, we can speculate using pre-order product listings published by Amazon and other retailers to reach a rough estimation.
The HTC 8X will be able to make use of O2's upcoming LTE network, which will be rolled out thanks to the carrier, Ofcom and the UK government reaching an agreement to bring forward the originally set date for when the UK will begin to see LTE be deployed by carriers.
Unfortunately, until more information is made available by O2, one can only register his or her interest to be notified of updates. Be sure to join in the conversation on our forum.
Source: O2 UK; Thanks, Big Supes, for the heads up!