As for capam, you should either buy now and short it if you think its over priced or buy it long if you think it is under priced. It should move pretty rapidly this week since this is its opening weekend.
As for the CAPAM2 and PIRT5, this are very hard to judge when and when not to buy, indeed. It takes some time getting used to this game to understand when these movies will stop being underpriced and move up. My guess is that they will jump drasticallly up in price on the first sign of news on either of the movies. Until then, I assume they will both fluctuate around 100-130. However, if you have enough money in your port, they should PROBABLY (not definately) both trend upwards in price over time.
The following statements are my guess at what is going to happen and should by no means be taken as fact.