Russ Bullock is the top dog at Piranha Games and in a podcast talk with No Guts No Galaxy told a little about the future of Mechwarriors. As you know, a DLC called Rise of Rasalhague is on its way to Mechwarrior 5 and will be released on January 26, but they are also looking a little further ahead.
Bullock says he's a little surprised they got to work on Mechwarrior as long as they did, but he really appreciates it. Furthermore, he reveals another standalone game in the series is now in development with them, and it is not a sequel to Mechwarrior Online and does not revolve around online PVP.
Instead, it's more in line with Mechwarrior 5, with singleplayer and co-op. It is supposed to be released for PC and "consoles", but he does not want to say more, apart from the fact that it will be announced for real sometime during the year, possibly as late as this fall.