Last week the FCC issued a notice of proposed rulemaking whereby the FCC is proposing certain modifications to their rules to better support new wireless medical devices. The also gave "notice of inquiry," seeking comment on new implanted and body-worn wireless medical devices (pdf press release). You can read the notice here (pdf).
This site gets lots of visitors using search terms for "wireless medical devices" and "standards" - there seems to be a lot of confusion about what is stipulated by FDA or FCC regulations and the frequencies and RF technologies allowable for certain applications. The short answer to these questions is that neither the FDA nor the FCC proscribe specific frequencies or technologies for medical applications.
The FCC's Medical Implantable Comminications Servic, or MICS, has not gotten much adoption. Many vendors have requested and received waivers (here's a good overview) seeking to use different frequency or apply some subset or variation of the MICS requirements. Less than a hand full of devices have adopted MICS in the 6 years since the band was created.
The latest major salvo from a vendor was the Petition for Rulemaking from Guidant, submitted last February (pdf document here). Titled, "In the Matter of Petition to Amend the Medical Implant Communications Service (MICS) Rules to Add Inductive Telemetry at 90-110 KHz, Expand the MICS Spectrum and Make Other Technical Changes in MICS," Guidant lays out a variety of proposed changes, some of which make it into the FCC's Notice of Proposed Rulemaking.
You can read a brief intro to MICS here.