Sony has 
posted the launch date (April 17th) and cost ($39.99) for 
Gran Turismo 5 Prologue.  What's interesting about the announcement is that the Blu Ray and PSN versions cost exactly the same.   This baffles me a bit as I was hoping for some kind of bundle for the Blu Ray version (like Sony did for Warhawk)  or a discount on the online version but no such luck.  The game does look great and I'm interested to see what Top Gear content makes this release.