The size of the map of Canada from current version (HERE 2013.Q4) is almost double the size of the previous version (2013.Q3). It is 313Mb instead of 178Mb.
Do we have a Canadian user that can confirm the current map is ok, and whether it has any improvement?

Currently running it in Ontario. Map works correctly and does include a bunch of road improvements missing in previous mapsets. Cannot confirm for the rest of the country though.

using in BC, works fine
lots of new roads which were not there with Q3

Using here in Québec..works fine, much more complete.

Currently running it in Ontario.
Maps work correctly and also include a bunch of roads missing in previous mapsets
Confirm - Mapsize is 351MB.

Do I need to copy all 4 map files to /content/map folder? Not sure or is only one needed?

As in the .fda, .fpa, .fsp and .fbl?

Yes, take a look here.