According to the Harper Collins Tolkien site forum
http://www.tolkien.co.uk/forum.aspx?g=posts&t=468 the edition will only be available for sale & delivery within the UK due to publishing rights issues - HC only have the UK publishing rights - though apparently there's nothing to stop foreign publishers (like Houghton Mifflin in the US) bringing out their own 'super deluxe' editions.
Nice investment though (or for selling via Ebay). I'm pretty sure you could get twice what you pay for it straight away of you decide to sell it on. Given what signed firsts of LotR go for its probably worth getting.