This was... unexpected. I was thinking that the series would have started early next year, not a month after the last series ended. It is pretty clear that Nickolodeon have pretty much abandoned Avatar after they pulled a FOX on Book 3 and forgot to advertise the show properly, but at least we are getting Book 4. What concerns me though is if Mir were rushed to get the series out so soon, or if they have been cranking these episodes out at the speed of light. It is kinda sad that this will be the end of Korra, and as far as I know, the end of the Avatar franchise*.
*[sub]Studio Mir have signed a deal with Dreamworks to produce 4 animated shows, and unless Dreamworks purchased the rights to the Avatar franchise, then they are going to have their hands full doing other work. Also, Mike and Brian have also stated that they aren't currently thinking about a post-Korra series and want to take a break for a while, but arent going to rule anything out.[/sub]