GT5 Prologue is priced; it's not free, but it's not bad
Despite rumours saying it could have been free, GT5 Prologue is looking like it's going to weigh in at around 40 Euros, which is £27 (so probably £29.95) or $54.
SCEE are keen to ensure everyone knows this is a full game, like Warhawk. With 40 cars and 5 tracks to choose from (plus I expect they will double up by offering reverse tracks) it sure seems like a full release.
Since GT5 Prologue is a nice stopgap whilst we wait for the full GT5 release, having a price point that's almost halfway between 'free' and 'full price' seems fair to me.