That number 30 actually approaches closer toward 100 if you include all of the pre-Darkage series novels which, if you consider that the Battletech universe had a relatively small dedicated fan base (at least in comparison to other franchises), is a great deal of literature.
However, to answer your question, I looked around a bit and it seems that the company Catalyst Game Labs purchased the rights to continue producing the game and publishing the books back in 2009 and had every intention of continuing story lines forward. However, after prodding about the announcements and product sections I couldn't find any new announcements regarding new fiction novels, only rules supplements for the game. After combing through the site for a bit I finally made my way through to the official forums to the following relevant thread which, if the collective cries of anguish are any clue, there seems to be no new novels planned anytime soon. This would definitely seem to be the case as the last official fiction to be published that was set in the Battletech universe, "Shadows of Faith", was done back in 2010 and wasn't even a complete work before Catalyst pulled the plug and only put forward the first few chapters. The source for that last bit, as well as a full book list of all available novels can be found here.
Sorry to be a wet blanket but it looks like for the time being, you're going to either have to go back to the older books, reread the Darkage novels, or settle for the large amount of fan-fiction that can be found within the forums. Hope this helped and good luck!