How does Blastdown even know all these things? Is season 4 already in progress or something?
I keep up with lots of things.
There is absolutely no information on Season Four yet. There is the possibility that they are working on Season Four along-side Season Three, like they did with Season One and Two, however it all depends on where they actually are with Season Three's production. (We still don't even know if the season got the other half ordered, or if the series is going to die right here with 13 final episodes)
My assumption is, I don't think they've begun work on a fourth season yet.
My reasoning for saying Twilight isn't getting married is simple: She's a (or
the) main character, with no prior love interest. It makes little to no-sense for marriage unless the series was ending, but even then you'd have to come up with more then just a random love interest. You can do that sort of thing with two unknown characters (Cadence and Shining Armor), but it requires more for a main character.
Also, there is more going on with the series too. She's still young, doing work for the princess, (assumingly) temporarily living in Ponyville during her current mission, and so on. It simply doesn't make sense. Also, a random friend giving out information with no source is sketchy.
