So, I'm one of the few with the CPM release of Slayers (all 3 seasons), and I can say that this episode made me cry tears of joy for three reasons.
First, I had NO FUCKING CLUE this was airing anytime soon. Just this morning, I was thinking that I couldn't wait for the new season. I though it was airing in December at the earliest. To see a screenshot of it pop up here all of a sudden induced the hugest geekasm I've had in years.
Second, it seems that they're following the Blast Sword story arc, meaning they're following the plot of the novels again instead of relying on pulling random shit out of their ass like in Try. I was relieved beyond the ability of words to describe when I noticed that.
Finally, it's been eight years since the first time I watched Slayers. Seeing this episode made me feel the exact same way I felt back then and reminded me of why Slayers is my favorite anime series of all time. Sure, it's just the first episode, but there was enough in it to make me think that they've once again recaptured the magic of the first two seasons. I have nothing but high hopes for this season now.