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"...all these worlds..." is a blog by David Hitt. It covers space exploration, decent science fiction, humor (by its very nature), and whatever else I happen to find cool. (Formerly "You Must Fight The Bear")
The possibility of having a member of the STS-114 crew stay on ISS as the third crewmember there is still open.
Another option would carrying a "nonprofessional crewmember" to symbolize NASA's commitment to flight safety, such as possibly a member of the Gehman Commission, or, even cooler, NASA Administrator Sean O'Keefe himself.
Current mission planning documents reportedly give an RTF date of NET July 15.
STS-114 would be followed by STS-121 on Discovery NET Sept. 16, which would be a follow-up to the RTF mission and would ease up some of the pressure on 115, 116, and 117.
STS-121 could also possibly be a crew-rotation mission, replacing Expedition 9 crew members Bill McArthur and Commander Valeri Tokarev.
If a crewmember is carried on STS-114 to supplement the ISS crew, it would likely be someone with recent ISS training/experience, but who is not in the queue for an upcoming expedition, such as Peggy Whitson or Don Pettit.