Was that end of the series? Is Seiya dead? I mean, Seiya gets into that epic fight with Apollo then it cuts to black and back into a scene that just shows a Saori doing dishes talking to a picture of Seiya and Seiya in the background saying how he has never been to a place like that before but he…

Don’t worry, it’s not canon. The writer was apparently pretty ticked off because the guy basically just ran off with the plot and did everything he wasn’t supposed to do. To get the ACTUAL “what happened after hades” story you have to read the Next Dimension Manga :)