Well, it's going to get a second season eventually.
If we know one thing, we know Japan will cash in on just about anything.(looking at you, second season of D.Gray Man.)
D. Gray Man wasn't done by Madhouse. Different studio means different reasoning's. I'm sure there was more than enough content to do it, and I'm also sure that D. Gray Man didn't exactly sell the best. I have no idea why they're giving it a season two either.
As for OPM, all I know is that the Amazon sales were terrible, and the manga got a significant boost in sales. I think it was around a 6 million boost from May to November. However, that can also be said by many other series as well. Hajime no Ippo had an amazing manga sale, I want to say it was #1 back in 2009. So why did New Challenger come out in 2009 and Rising didn't come out till 2013? You could argue content but I didn't read the manga. But, did it really take four years to get enough material for 25 episodes? Call me crazy, but I think most authors do that in maybe a year or two.
Time will tell. At the very least, a season two announcement would be possible late-2016.
First off, the fight was outstanding. I think this had more scenes and frames used than in an entire series such as [Insert Shonen]. The one thing they did that was to be expected was play the opening during the fight scene. I'm glad I have good speakers, because they were on max during the entire fight and I'm sure my neighbors enjoyed that. My jaw was dropped the entire time.
Secondly, they changed literally nothing. Okay, that's not true. They did change Saitama not talking on the moon, but I think that was for a more dramatic atmosphere. What he was supposed to be thinking was "can I breathe here?" and "I hear the gravity is different, can I make the jump back to earth?" It's not a big change and honestly it's nothing to critique. They did a good job changing it and I'm actually pleased.
Overall this episode was outstanding. I'm not a big shonen fan. I much prefer mystery and solving puzzles, but when a good webcomic gets animated such as One Punch Man, you can't really not watch it.
And for the people that will be curious: Season two is more than likely going to happen. It will take a long time, but realize that the manga is still on-going and this takes time. He's redrawing from a webcomic that any kid in elementary could come up with, so Muruta will either be working hard to get it going or he'll stay on pace of "maybe we'll have a chapter this month, maybe we won't." The next concern is Madhouse and if they're going to be doing it, but I think when they see how much money they'll get from Merchandise and such, there is no way they'll ignore it. The manga sales are going to sky-rocket after this.
OST release: January.
Season two(possibility) and fights to look forward to: Garou. It's 10x better than this one.
Anime was great, final episode was best of them all.
The overpowered main character tho. q.q