Season 5 of My Little Pony: Friendship is Magic is the most recent season to be announced. It is set to be released later in 2015. As of February 2015 there is no information about any additional seasons to come.
No. There will be a season 5.
No. It is the last episode of season 3, but there will be a season 4.
No. It was the last episode of season 3, but season 4 started up on Nov. 23rd, 2013
Probably not. It has been said by the production team of Equestria Girls that Equestria Girls was meant to be a standalone, and not be connected to the TV show My Little Pony: Friendship is Magic.
No. The show is currently about halfway through its fourth season, and a fifth season is planned, so the series will last until at least 2015.
There has been no information released as to whether season 5 will be the final season, though some might say the trailer seemed to imply it.
So far the castle has not been repaired and no further effort to do so has been undertaken.
Well Magical Mystery Cure was the last episode of season 3. There are no episodes after it, until season 4. It was released on Nov. 23rd 2013, as a two-parter entiteld "Princess Twilight."
It is very likely that it will be opened in the last episode, though we cannot know for certain. It is possible, for example, that it could be opened in the first part of a two-part finale.
Rarity is her full name. Some of the ponies have two-part names and some have one, such as her and Fluttershy.
It will likely be on May 3 if it is a two-parter, assuming there are no weeks without a new episode. If the finale is only one episode, then it will air on May 10.
Magical Mystery Cure is from season 3, episode 13 (s3e13). It is also the last episode of season 3 of MLP:FiM. Therefore, there isn't another episode after that, for the season.On Nov. 23, 2013, season 4 started with a two-parter, and it was entitled "Princess Twilight Sparkle(part 1 & 2)"