Gran Turismo 5 Prologue will launch in America on April 17, says this, priced $39.99. The precursor to the full game, which currently has no fixed date, will be available via PSN or on Blu-ray disc. Over 60 cars will be included in the release, as will online racing for up to 15 people simultaneously. Bargain.
Gran Turismo 5 Prologue is still down as a "spring" launch for Europe. Which it clearly isn't.