Interestingly, Feb. 27 is a Friday and not the usual Tuesday release date we're so used to seeing in North America. Friday is typically the day games come out in Europe, and while SCEE refrains from getting specific, they've told Eurogamer: "We are targeting a similar timeframe for the release of Killzone 2 in the PAL regions." To us, a worldwide release on that day seems very likely.
Source 1 - PS.Blog
Source 2 - Eurogamer