So, now it seems to be clear.
No official gta 4 bundle for the 360. Sony has paid to have the exclusivity of that.
All these things, i report before, are rumor for the moment, even if we will be able to learn the true plans of microsoft this week, because week before the launch of gta 4.
For memory, the bundle gta 4 and ps3 will cost 450 € in France
http://www.alapage.com/-/Fiche/JeuxVideo/639251/ACCE/console-sony-playstation-3-40-giga-gta-iv-sony-playstation-3-accessoires-de-jeu-et-consoles-playstation-3-consoles-et-packs.htm?id=233061178660804&donnee_appel=ALAPAGE
if alapage says right.