It has definitely increased pop, especially during prime hours. There are still slow times, or at least what appears to be slow on fleet, but there are still many online throughout the planets and opposite faction. Can't always judge the server pop by fleet alone.
Im a west coaster, so about the time the Imp fleet and qued PvP dies off, I go to do an hour of questing before logging for the night. Just a night or two ago: Imperial Fleet - 45 players, Nar Shadda - 60 or 80. It is impressive.