Funko just posted an entry to their blog detailing the upcoming wave of Doctor Who Pops. In it, they have confirmed the rumours of a K-9 Pop! that will be available exclusively from GameStop.
The Silence Pop! is also listed as being a Hot Topic pre-release, so you won't be able to find those anywhere else for the time being, but they will eventually be available everywhere.
If you missed it, Hot Topic will also have an exclusive Ninth Doctor with a banana. Other exclusives from this wave include a vortex manipulator variant of Jack Harkness available from FYE and a regenerating 10th Doctor which will be a ThinkGeek exclusive (which you should also find at GameStop as they are now the same company).