There are quite a few static displays around, and only one currently flying, "Fifi". I am waiting for Doc to be flying again. I am hoping to one day see Doc and Fifi together in the sky.
Wikipedia lists these as one day possible restorations. Keep in mind that Wiki is not always the best source.
Under restoration or in storage (complete airframes)
B-29
44-69729 – shrink-wrapped and stored outdoors with the outer wing panels removed at the Museum of Flight in Seattle, Washington. Facilities to store the aircraft indoors with the Museum's B-17 are in the final planning stages.[36]
44-69972 Doc – being restored to active flying status. After a three year absence due to lack of funds, restoration has resumed in February 2013 in the Kansas Air National Guard hangar across from the Kansas Aviation Museum in Wichita, Kansas; no longer accessible to the general public.[37]
44-70049 – in storage for Kermit Weeks at Borrego Springs, California. One of four B-29s obtained by Walt Disney Studios from the U.S. Navy at NAWS China Lake, California for use in the movie The Last Flight of Noah's Ark.[38]
45-21787 Fertile Myrtle – Restored Nose Section and remaining unrestored fuselage sections are on display at Fantasy of Flight in Polk City, Florida. The rest of the aircraft is in storage at Aero Trader in Ocotillo Wells, California. This aircraft was used for the flight sequences in the Walt Disney Studios film, The Last Flight of Noah's Ark.[39]
Under restoration or in storage (partial airframes)
B-29
42-24791 The Big Time Operator (nose section only) – currently in Maryland awaiting restoration for the QuestMasters Online Museum May 2014.[40] previously in storage at the Edward F. Beale Museum at Beale AFB in Marysville, CA.[41]
44-69957 (wreckage) – in storage at Naval Air Weapons Station China Lake in California. Took a direct hit from weapons testing. The nose was used in the restoration of 'Doc'.[42]
44-70102 Here's Hopin – in storage at the Naval Museum of Armament Technology adjacent to Naval Air Weapons Station China Lake in Ridgecrest, California.[43]
44-84084 – in storage for Kermit Weeks at Borrego Springs, California. One of four B-29s obtained by Walt Disney Studios from the U.S. Navy at NAWS China Lake for use in the movie The Last Flight of Noah's Ark (see 44-70049 above for the other surviving example). Wings were installed on 44-61535; other two Disney B-29s were destroyed (44-62112 and 44-62222).[44]
B-29A
44-61739 (nose section only) – in storage at the Museum of Aviation at Robins AFB in Warner Robins, Georgia.[45]
44-62134 – in storage at Naval Air Weapons Station China Lake, California.[46]