Go listen to Memoriam, it's a sort of a successor band to Bolt Thrower. Even the name is a direct reference to Martin. Karl Willetts does the vocals and the sound is pretty much the same. It has/had other members from BT, then the rest come from Benediction and Sacrilege

They've put out five albums in six years (!), one recently

I can't see it happening, since Martin Kearns died they've done nothing and I expect it to stay that way. Perhaps they'll do the odd gig here or there, but tbh I'm happy not hearing a Bolt Thrower album with a different drummer.