One quiet little addition to the new iPad is Bluetooth 4.0, complete with a little something called "Smart Ready". What does that mean, exactly? For one, it's lower-energy than the last iteration, which is always good news. This opens up the door for peripherals running on a simple coin-cell battery, like you might find in a watch. The "Smart Ready" designation will allow the new iPad to connect to smart accessories, like heart rate monitors, by providing a channel for all sorts of different data types. Bluetooth 4.0 also has better range, though it's not clear how much better it is.
Apple had already got on the Bluetooth 4.0 bandwagon with the iPhone 4S and some models of Mac. That's interesting because, despite all of the high-horsepower Android tablets to come out of the woodwork, Apple is still going to be the first one in the tablet space to include the Bluetooth 4.0 spec.
While the slight change in thickness may irk extremely size-concious iPad accessory makers, those that provide any kind of wireless connectivity will likely be interested in the new Bluetooth 4.0 capabilities, and may be able to do some new and interesting stuff with the spec, like Find my Car.