1. the 83's changed design about 2 years back. My school ordered a batch of like 90 and half were the old design and half were the newer one like the pic at the top of this thread. There's another one that's even older that looks like the old one but has a tilted screen. The new design TI83's come with a link cable like 4 inches long, the old TI83's had like a 1 metre cable... go figure.
2. The WA2.x TI83 skin should load in WA3 but not all the features will be enabled yet..