Inuyasha Final Act is indeed a pacing nightmare
Sunrise, have you lost your mind? 12 chapters in a single episode?!?! Have you learned anything from animating Tales of the Abyss? You can't cram 20 volumes of content or 70 hours of playing into a 26 episode anime!
Next episode is "Kagura's Wind" and if Sunrise blows through a certain scene, there will be a shit-ton of angry fans (not me though <__<).
Edit: To watch the episode and preview at the end, go to the Shonen Sunday website.
Edit 2: Next week will cover a minimum of 8 chapters, including chapter 404 for some reason.
Edit 3: During the Inuyasha Final broadcast earlier today, an animated Kyoukai no Rinne commercial advertising Weekly Shounen Sunday was shown. Keep in mind that this doesn't mean a Rinne anime is coming anytime soon. There's very little to animate right now. Do note that a similar commercial was done for Inuyasha back in 1997. The anime didn't start until 2000.