Yes, there will be a season 2 of LoliRock. Team LoliRock from tumblr stated in the beginning of this post about the production of season 2 that, "It's progressing, slowly but surely. Our teams, both in France and Malaysia (Inspidea) are working hard to make the best show we can."
Even though they said this, they haven't released an official release date announcement for it yet. All we can do is wait patiently until Team LoliRock announces the release date of season 2 probably in a few months from now.