So, I've seen the first episode of the new filler. It's certainly not as intensly epic as the first episode of the Muramasa arc. No interesting antagonist are introduced, meaning there most likely won't even be any 'major' antagonist, just those dialogue-less berserker dudes known as the Beast Swords or Sword Fiends (As I've seen it subbed)
It feels like they're trying to distract us with something stupid while the manga progesses and not entertain us like they did with the previous filler. Put bluntly: It's gonna be bad.
On a positiver (Huh?) note, the manga chapter is indeed a really good one. For once, they actually do something.
P.S: The names of the episode don't really reveal what happens in the actual show. Most of the time, they're not even true, but, if you insist, I'll gladly put the spoiler thingy