[img align=left]http://dl.dropbox.com/u/1296721/charmsnews/249Lugia.png[/img]Online retailer Play.com have posted a release date for HeartGold and SoulSilver in the UK: March 26th, 2010. Although this is very, very tentative - the listing doesn't even have box art or a description yet, it bodes well: most speculation so far has put the release date somewhere in May for Europe. Obviously, being released less than two weeks after the American version would be excellent, and a huge step forward from the 2-3 months (or more!) we Europeans traditionally have to wait for Pokémon games.
As usual, take this with a pinch of salt until we see it confirmed - Play.com are a large and reputable retailer, but like any business, they are prone to wild guesses. I'll update here if we hear any more.