Optional 4G LTE service would help set the iPad mini apart from leading 7-inch slates--specifically the Kindle Fire HD, Google Nexus 7, and Barnes & Noble Nook HD--all of which are Wi-Fi-only. Cellular connectivity has its pros and cons, of course. On the plus side, it enhances iOS 6 features such as Siri voice interaction and spoken, turn-by-turn directions, neither of which is much use when you're offline. Since the 3rd-gen iPad offers LTE, it would be surprising if the Mini didn't as well. From a cost-of-ownership standpoint, cellular connectivity brings with it a higher up-front cost--currently $130 per model--and well as a U.S. monthly service fee ranging from $15 to $50 from either AT&T or Verizon.