It's possible, given how far along The Last of Us was coming straight off the heat of U3 at VGA 2011, but I think its more likely that we see a trailer at VGA 2013, and then the whole internet explodes.
I can imagine the unveil. Just starting to play Nate's theme with a black screen, and then Drake shows up.
Or they could do a Twisted Metal reveal, that was phenomenal.
VGA is honestly too late for the internet to explode, especially for the crowd that buys the consoles at launch. Sony needs to get people hyped up for the console before the nextbox and ps4 are out so they end up buying a ps4 instead of a nextbox.
What'll happen with a vga reveal is:
internet explodes, a good chunk of it is like "aww why did I buy the nextbox when this game looks far more interesting to me than these other games coming out for it, oh well, guess I'll have to miss out on it for a while until I buy a ps4 next which won't be anytime soon"
Rather than have that, sony would want the internet to explode and have that chunk that were leaning towards xbox but could get pushed over go "holy crap, hell yeah, I want to buy the ps4 over the nextbox now" and do so.
Yes, I know the ps4 will be sold out for a good while after launch regardless, but these people who could go either way buying one at launch is really important. The sony fans are going to buy it regardless, getting this crowd to buy it is going to be directly related to how successful they are overall.