The 2012 NBA training camps have recently started, but that hasn't stopped several rookies from raising their stocks significantly with their early play.
The NBA Summer League is usually the first time a rookie's performance will be judged, but oftentimes it's a poor sample size because of the pickup style of play and the lack of competition.
Training camp and the preseason is really the first chance for NBA rookies to impress their coaching staff. Some rookies will play so well in practice and in the exhibition games that they'll actually earn themselves a spot in the starting rotation.
It's important to not get too excited over these performances; however, it can show you flashes of what is to happen.