I actually never thought this season would happen after so long. However, I'm thrilled. This did justice to where the series left off stupendously and adds depth to where the very last episode of S2 was.
Rather than "just something a little more," this was a full blown season (just in a 5 episode longer episode format). Lots of great character development, heartwarming and heartbreaking moments.
If you haven't watched the first two seasons, watch them, if you have, this will not disappoint.