The new Google Nexus 7 is coming to the UK on the 28th August, however we will only be seeing the wifi versions, £199.99 for the 16GB version and @239.99 for the 32GB version. There is no news on the LTE (4G) version coming to the UK.
I really like my original Nexus 7, it’s my favourite travelling device, much easier to carry about than the iPad. It’s much more portable than the iPad mini and fits into more pockets and bags than the iPad (or even the iPad mini).
I don’t think I need to upgrade my existing 7” Nexus, though I do like the idea of the “retina” screen, but I do think having a 4G Nexus would be useful for travelling, without worrying about having to tether to my phone, so would consider upgrading it, if there was a 4G version available. I do think we will see cheaper and more widespread 4G over the next year or so.