We can confirm that 2 out of 4 are region free!!
Firstly, both NBA 2K12 - 360 (Region Free) (Preorder) and Spider-Man: Edge of Time - 360 (Region Free) (Preorder) ARE PAL REGION FREE but unfortunately both Dark Souls Collector’s Edition - 360 (Preorder) and Rage [Anarchy Edition] - 360 (FREE SHIPPING WORLDWIDE) (Preorder) are not pal region free.
Look for more region free tests soon!!