The next two LEGO Ideas sets have just been announced! They will be The Big Bang Theory by Alatariel and collaborator GlenBricker as well as The Bird Project by DeTomaso. Congrats!
The LEGO Review Board is still evaluating the two Doctor Who concepts and will update us soon whether they will be made into official LEGO Ideas sets. All other projects (Back to the Future Train and Modular Apple Store) from the first 2014 LEGO Review period will not be produced into official LEGO sets. Full details available at LEGO Ideas Blog.