I read a lot of mixed things but to be honest I don't think the mangaka ever stated anywhere that it'd come back :< There's going to be an OVA bundled with the DVDs I think, called Fairy Tail x Rave, which I guess is a crossover of FT and Rave Master but ehhh. Honestly if the animation quality is going to continue being that poor then maybe it's best if it didn't come back but... still ;~;
and yeahh I loved the sabertooth slayers! I keep up with the manga now too and I'm reaaallyyy excited about where things go. It's so action-packed right now :O And I hope so they do go back!! ahhhh