Received the following via email.
The first of BNSF's Heritage Covered Hopper cars has been painted: http://i1156.photobucket.com/albums/p579/lasupport/IMAG0084.jpg
More to come, covering all nine predecessor roads (reportedly three of each of ATSF, BN, CB&Q, C&S, FW&D, GN, NP, SL-SF and SP&S), all to be painted gray.
Here is the photo referenced above.