The biggest announcement of the upcoming Apple WWDC 2009 and the biggest question mark as well is the new version of the iPhone. A new model is coming for sure, but we don’t know what will be in it, exactly.

Most probably, the new Apple cell will keep its current design. Since Steve Jobs came to Apple, dramatic industrial design changes have only happened across various generations of gut changes. Historically, the iMac, the Powerbook/Macbook, or the Mac Pro went through several iterations before experiencing a complete redesign. It’s too early for the iPhone to change its face dramatically, specially when the current form factor works so well. And, after all, there are only a few ways to do a touch-screen phone. The iPhone 3G’s design is simple, elegant, and works extremely well, so there is no reason to see a big re-design now.

Some people are talking about multiple color versions. With the iPod mini, nano, and shuffle, color became a way to convert the low-end hardware into fashion accessories. The iMac also went through that phase, which was later abandoned.

The iPod, however, always stayed either white or black, becoming an icon on its own right. The iPhone is also a higher-end icon. Down the line—maybe in a different incarnation, as the iPhone OS product family expands—color will appear. But for now, looking at Apple’s past history, logic dictates that the iPhone won’t see the variety of colors that the iPod nano has now. It just doesn’t fit.

More to come as the date gets closer.