Q: How to differentiate Ipad 2 from New Ipad (Ipad 3) ?

The model number.  The screen resolution.  The serial number...

There is an iPad, iPad 2, New iPad (3), iPad 4.

Go into your Settings, General, About

What Model does it say you have?

I have model number FC733LL

This is the new iPad (3) version

You will have to check the other numbers of the iPad 2 and the iPad 4 to see what they are.

http://support.apple.com/specs/#ipad

Compare iPad Specs http://www.apple.com/ipad/compare/

 Cheers, Tom

Identifying iPad models: http://support.apple.com/kb/HT5452

The newest iPad is 4th Generation. It has the retina display and lightning connector not the 30 pin connector. 

The only way I know to tell an iPad 2 from the iPad 3rd generation with out a lot of hassle is to run the model number thru Apple.

Easy, just look at the bottom where the power cord connects.  The new ipad4 has a small slot lightning connector and the ipad2 has the old wide slot 30 pin connector that can only be attached face side up.

Btwn the ipad2 and ipad3 just look close up to the screen.  The ipad2 you can see the pixels and in the ipad3 you cannot.

One way is to download "geekbench 2" and it'll tell you. Another way is to weigh, the iPad 2 is lighter than the new iPad and iPad with retina display. One more way is that the iPad 2 has a much more noticeable lower resolution screen compared to the two latest ones. Also check this out - http://support.apple.com/kb/HT5452

I hoped I helped!!!

Easier!

iPad 2 doesn't have Siri, iPad 3 does.

Go to Settings -> General and you will see.