Will this require updated hardware, or is it enough to update the software stack for devices with 4.0 hardware? The FAQ wasn't clear. (The FAQ did go on for le

Will this require updated hardware, or is it enough to update the software stack for devices with 4.0 hardware? The FAQ wasn't clear. (The FAQ did go on for lengths about branding "bluetooth 4.2" vs "bluetooth smart" vs "bluetooth smart ready" vs "bluetooth". Have they learnt nothing from the "HD Ready" silliness? Also it's weird to see that "bluetooth low energy is an optional part of the specification". Sounds like a "fun" spec to implement)