Reviewing Emily's Passenger and Brake Coaches in a YouTube video, narrator and owner of LSOL.com (Large Scale Online), John DeKeles said the following at the 3:58 mark.
The Emily Coaches are supposed to be pulled by Emily which will be coming out soon.
For further confirmation, SI3DFilms recieved a message back from gardentrains concerning it's existence; The cars are available now and the engine will be available at the start of next year.
Bachmann's Large Scale Emily arrives in model hobby shops worldwide starting next year in 2012.
Thanks to SI3DFilms for confirmation of the email.