User blog comment:Wahidkarzai/Series or Season?/@comment-179280-20131004181525/@comment-25358468-20140201164521

You're right, they don't have seasons. But the article does state that there will be a "sequel," and most likely not No Regrets or the other spin-off, but what you talk about as the "filler" arc, which you're probably referring to as the Clash of the Titans arc. If it makes you happy you can remove what I put on the Attack on Titan (Anime) page, as I don't want to create conflict or an editing war.

Also, directly from the article, it states:

"The manga comic the anime is based on is still ongoing, and all of us on the staff are following and loving it," the studio head gushed. "Eventually, we definitely want to do a sequel. This year, though, we've got our hands full producing an anime that will be bundled in a limited edition of the Attack on Titan manga, which tells a different sort of story than what we did in the TV series."

That seems to imply that they're following the manga, and want to definitely put it on the big screen, but are working on something else this year, that is obviously Attack on Titan related seeing as he says it "tells a different story than what we did in the TV series." This could either be No Regrets or Before the Fall.

So feel free to remove my statement on the page, but you have to admit what he refers to as a "sequel" is what, in English, would probably be considered a second season.