Is the new model number for iPad MC706B? What was the model number for iPad 2?

Not sure about the New iPad, but the model number for the iPad 2 is A1385.

That model number shows up as a generation 3 pad in google. ( also mc706a)

iPad 2 Model No: A1395, A1396, A1397

iPad 3 Model No: A1403, A1430, A1416,

iPad 4(current model) Model No: A1458, A1459, A1460

You can learn about serial numbers, model no's about iPad, iPhone, iPod and Mac from: http://www.everymac.com/ultimate-mac-lookup/