Re: 2012 Overland sadle ....
Welcome! The Summit has a bit more chrome on the exterior and comes standard with the ACC package, as well as a rear electronic locking diff and dark ash wood w/ a saddle dash. The dash on the standard Overlands is just black leather (which I personally think looks better). If you don't think the extra features are worth the additional ~$4,000, you can always just get the ACC package or additional chrome pieces separately.
Here are a couple pictures of my True Blue. I added the chrome fog light surrounds, which are standard on the Summit.
2015 WK2 SRT - Billet Silver
Previous Jeeps - '12 WK2 Overland, '99 WJ, '96 ZJ, '93 ZJ (Caged & locked on 35s)