yep.

The X360 initial boost will evaporate within 12-18 months of the games release.

Also as an edit, GTA4 PS3 will overtake the X360 version

I agree, the PS3 version should be slightly ahead, and if sony secures some sort of dlc then it will just help it.

PS3 would win slightly. IV only has a 500k gap and that was with a ton of MS marketing and timed exclusivity of the expansions.

But in the grand scheme compared to GTA sales of last gen, which grossly favoured the PS2, id say its a strategic victory.

gta is more a playstation franchise so yeah, i think it will be already close from beginning, maybe even selling already as much the first months but not sure, i have no clue how big gta is in usa against europe, if it is much smaller in europe then not the first months.

Hard to tell. Both will do over 10 million copies. The 360 version will do amazing in the US, while the PS3 version will destroy in EU. The PS3 version might have a slight lead, seeing that the PS3 version has a shot at doing 400-500k there

Doubt it to be honest. But I think they will be closer this time in sales.

Closer?
They are only 500k apart and that was from a time when
a) the 360 had still a massive lead
b) the PS3 was expensive as hell and no one could have afford it
c) Microsoft had Exclusive Deals and had a marketing where people could think its a 360 exclusive

The PS3 version will outsell the 360 version and that with a bigger gap than 500k at the end.
Europe will push it over.

Nope, I'm getting the 360 version for achievements, which I'm sure many others are also doing

Yes I know but thanks to that exklusive time DLC alot of GTA fans have gone over to Xbox360. + I think MS will gain Exklusive time DLC this time again.

You could say the same for trophies, which I'm sure many others are also doing