Okay, I've watched all 3 special episodes for the 1st season as well as the "Someone's Watching" OVA, pretty decent stuff.
I'm about to watch the first 4 episodes and to be frank, I've pretty much forgotten some of the minor details of this series, apparently season 2 Railgun will be the expanded version of the Sister's Arc, which most of us know about from either season 1 or 2 of the Index animes.
So, Railgun S will be the Sister's Arc in Misaka's POV with much more expansion due to the Railgun LNs, I'm okay with the concept but all 24 episodes focused on the Sister's Arc sounds kinda disappointing, especially since we sort of know the conclusion to the entire matter. I guess fo most, they're just okay with seeing Biri-Biri again.
Man, I just want to see a 3rd season to Index already but I will watch Railgun S now and follow it to it's conclusion.
EDIT #1:
Yes, I love being critical over this specific series. First episode was a good start and my favourite part of it was at the end when Touma appeared. I think Misaka is an "okay" character but I really really like Touma's character and he's probably my favourite in this entire franchise so far. I say so far because I know there's a bunch of characters out there waiting to be introduced in the anime adaptions and I know some of my favourites but I shall refrain from saying their names because of the potential of it being a "spoiler".
EDIT #2:
After catching up, all I have to say it's interesting but slow. I guess I'm looking forward to when Misaka finally finds out what her "sisters" are being used for and when she witnesses Accelerator killing one of her many sisters (if that actually ever happens in front of her....I can't remember to be honest).
Anyways, next episode will be pretty good judging from the preview with cute interactions between Misaka and her sister, as well as, Accelerator coming into action in this series.
EDIT #3:
There's so much material for both Index and the Railgun series....why aren't they dishing out the series more often is what I wanted to say but then I did a little research. The interval between a Railgun series and an Index series has been 6 months but the interval between Index 2 and Railgun 2 is 2 years, I guess it's not that big of a deal since there was a Railgun OVA and an Index movie.
Anyways here's hoping for Index Season 3 to be announced soon.