Apple isn't a traditional tech company. The majority of Apples 'new products' aren't new at all. They are just a new iteration of an existing product.
Many tech commentators look at the iPad 3 and see it as make or break. They want reason's why you would toss aside your iPad 2 and buy an iPad 3. The fact is though, if you don't want to piss away your money you will not get an iPad 3 if you own an iPad 2.
Its like like if you own a 2010 iMac you didn't buy a 2011 iMac (I assume there was a 2010/11 iMac). While the latest model is superior, quicker, has better gizmo's etc. The one you have is just fine.
The iPad 3 will be the continued evolution of the iPad product, just as the iPad 2 was. This isn't a new product, Apple is just continuing to keep its product up to date.