Please see what we have been doing for a long time: IPv6 over BTLE, which is still one IETF draft in the 6LoWPAN WG, and the proposal has been approved in Bleutooth SIG. Here is the news in BLuetooth Technical Updates: 19 Feb, 2013.
IPv6 Over Low Energy New Work Proposal Approved
The IPv6 Over LE New Work Proposal (NWP) submitted by Bluetooth SIG
members is approved. This NWP proposes that permitting IPv6 over the
Low Energy transport will enable new use cases (in home and industrial
automation as well as smart metering) not covered by GATT profiles.
The proposed work meets the requirements defined by the Internet
Engineering Task Force (IETF) as well as complements the work done in
the IP for Smart Objects (IPSO) alliance. The Internet Working Group
will develop a Functional Requirements Document (FRD) based on the
approved NWP. If you are an Adopter member and want to participate in
the FRD development process, please contact the Internet Working Group
Chair.