charliefoxtrot answered your question: iPad 2.
If it has the “retina display” and the camera is 5-megapixel then you have the latest one. If not, I dont know about upgrades.
It says “iPad 2” on the back… so I’m assuming I don’t have the latest one? I keep seeing things for an iPad 3 but I didn’t know if it’s out yet or what…?