I wouldn't expect to see a dramatic increase in software now. I would expect to see an increase in about a week or two. There are a few factors to take into account.
1) Older games would see a higher increase because they are cheaper.
2) Used games would take a significant portion of game sales.
3) Bundles.
4) And let's be honest, even though 300 bucks is a nice price point, the average person's wallet still feels it. I mean, if I blew 300 dollars on a console, I don't think I would have enough left over cash to use on like 5 or 6 games at the moment.