I take it you haven't been keeping an eye on the game news? They were going to end updates after season 4, but decided to start work on new content. That new content won't be ready until December though, so until then they're recycling seasons 1, 3 and 4 (not enough time for 2). Plenty of new players since the first round of seasons, and for the rest of us, at least it's better than nothing.