My Little Pony Friendship Is Magic - 2010 The Crystal Empire - Part 1 3-1 was released on:
USA: 10 November 2012
Ukraine: 16 September 2013
The Crystal Empire is the Rainbow Kingdom in your Little Pony Friendship is Magic.
My Little Pony Friendship Is Magic - 2010 The Crystal Empire - Part 2 3-2 was released on: USA: 10 November 2012 Ukraine: 17 September 2013
The Crystal Empire is not yet considered to be the Rainbow Kingdom, but is suspected that is will be designated this title in the Season 4 Finale.
My Little Pony: Friendship is Magic started November, 10th 2012 with the two-parter "The Crystal Empire"
It has been suggested by the synopsis of the Season 4 finale and by press releases from Hasbro that the Crystal Empire is in fact the "Rainbow Kingdom". What this means is unknown.
This information has not been revealed yet. In the Season 4 Finale, this information will be available.
Yes, it is because of Twilight Sparkle Using it as a home is the Crystal Princess Palace and The Castle of the Royal Pony Sisters from My Little Pony Friendship is Magic.
My Little Pony Friendship Is Magic - 2010 was released on: USA: 10 October 2010
My Little Pony Friendship Is Magic - 2010 MMMystery on the Friendship Express 2-24 was released on: USA: 7 April 2012 Ukraine: 23 July 2013 Japan: 11 March 2014
My Little Pony Crystal Princess The Runaway Rainbow - 2006 VG was released on: USA: 13 September 2006
My Little Pony Friendship Is Magic - 2010 Pinkie Pride 4-12 was released on: USA: 1 February 2014
My Little Pony Friendship Is Magic - 2010 Three's a Crowd 4-11 was released on: USA: 25 January 2014