The episode list for the "Adventures in the Crystal Empire" DVD has been released:
- The Crystal Empire, Part 1
- The Crystal Empire, Part 2
- Sonic Rainboom (Season 1, Episode 16)
- Luna Eclipsed (Season 2, Episode 4)
- It's About Time (Season 2, Episode 20)
It looks like the only season three episodes included will be the Crystal Empire ones. Still, it's a decent collection.
Also! Under the cut is a synopsis for the Crystal Empire episodes. Beware of spoilers!
In Adventures in the Crystal Empire, a magical empire has suddenly appeared in the arctic north of Equestria, and PRINCESS CELESTIA needs TWILIGHT SPARKLE and her friends to find a way to protect it. While her friends try to keep the Crystal Ponies occupied at the Crystal Faire, TWILIGHT SPARKLE searches for the hidden Crystal Heart that is the key to keeping their empire safe from harm! - Shout Factory Press Release