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4th-gen and 3rd-gen iPad comparison
Literally, the only external difference between the latest iPad revision and the 3rd-gen is the plug. For clarity, the top iPad is the latest, 4th-gen version.
4th-gen, 3rd-gen, and iPad mini comparison
With the iPad mini and the 4th-gen iPad comes a change to the text at the bottom on the back. Where the size of your model used to be indicated (as seen on the 3rd-gen iPad at the bottom of the pile), there is now just branding and other misc. information. To know how much space is in an iPad now, you must check system settings.
iPad mini and 4th-gen iPad WiFi comparison
Some Apple devices have a history of bad WiFi connectivity, but here, it appears as though the WiFi cards are different in each new iPad. The menu on the left is on the 4th-gen iPad, which picks up more wireless networks than the iPad mini does, as seen on the right.