"IGN also mentioned that even though an airdate for Book 2 isn't out yet, Nickelodeon has said "it would be back later this year". Fingers crossed that there would be some news at SDCC in July."
SO I think it's safe to say that "Mid-April" is out the window, as far as learning the release date, or the actual release itself. Now begins the waiting game, again. However, there is some good news!
San Diego Comic Con comes up in July, and is usually an awesome source of information for new Avatar news. If you were a fan back in the good ol' days - when we were waiting between Book 2 and Book 3 of Avatar the Last Airbender, AWS anyone?? - one of those SDCC's gave us this [link] incredibly epic trailer for Season 3.
So, think we'll be treated to something like that this summer?? We can only hope!! And you know if we do see a trailer like that, we're gonna see some Borra. No doubt. So live on live strong Borra fans! It's coming soon!!