Some cool things to potentially integrate with SmartThings on this Product Hunt list of Smart Things (unfortunately SmartThings is not one of the Smart Things). http://www.producthunt.com/e/smart-things
Almost all of those are Bluetooth, though. The ones that aren’t are mostly already connected to smartthings, at least through community code. 
hubv2 will have BT right? 
Perhaps…
It’s been announced with Bluetooth, but we don’t yet know any details about what that means from a use case standpoint. 