BusinessWeek is reporting on analyst predictions for next year’s iPhone 3G numbers. One of our favorite analysts Gene Munster, from Piper Jaffray, sees a very optimistic future.

Many analysts expect Apple (AAPL) to sell around 11 million iPhone 3Gs in 2008 and another 25 million in 2009. But perhaps the most optimistic forecast is from Piper Jaffray (PJC) analyst Gene Munster, who expects the company to sell 13 million this year and 45 million next year.

BusinessWeek claims to have some information that points to Apple’s plans to build over 40 million iPhone 3Gs during the next 12 months. This is actually even more iPhone 3Gs than the optimistic Munster expects Apple to sell in that time frame, 52% more.

More iPhone rumors and predictions after the break.

Piper Jaffray analyst Gene Munster, a WWDC attendee, decided to hang around after the keynote and survey a few developers about their work with the iPhone SDK.

One of the most interesting of Munster’s findings was the fact that a whopping 70% of developers interviewed said their apps will be free. Also, 50% of developers are making “Enterprise Apps,” with 15% using location based APIs, 20% writing video games and entertainment apps, and another 15% writing “Enterpirse-level apps.”

Read on for more info on his findings.