I have heard from an untrustworthy source that theres actually more than 5 maps in the DLC, Golden camos for example. Although like I said, it's untrustworthy and I really doubt it. If there is something extra, it'd be a nice surprise, and definately make me buy it.
But otherwise, theres no chance I'm buying it. I already feel like an idiot for paying 1200 MSP for GTA: San Andreas just because I liked it on PS2. It's shit on Xbox, the controls are so messed up. :| I only bought it because there was nothing else to spend the points on (I'd had them leftover from buying FO3 DLC). And even worse, a month after I bought GTA: SA, it's priced has been halved as a deal of the week thing.
But like I said the only way I'm paying this pathetic price is if theres something extra with the maps. At least theres one thing to be happy about though, the new maps actually look good. COD4's map pack was absolute shite, except for Broadcast.