Not extremely interested in the franchise myself, but it would be interesting to find out how well this sells.
Presumably R* is making two lots of DLC for the 360, one nowish and one a bit further down the line.
What worries me is that by them GTA4 will be almost a year old on the 360, and I'm sure interest will have waned across all platforms by then with the possible exception of the PC version. Will we see another Bioshock effect?
If R* can't pay MS back, they'll probably have to do something drastic for MS in leu of payment...could that be making GTA5 exclusive to 360? could MS not want R* to be able to pay them back? my tinfoil hat is itching again...
When is this first DLC being released, is it still mid-Feb?
And will there be any way to track the sales outside statements from R*?

Proud Sony Rear Admiral







