A website called TV Shows on DVD has a small blurb up about the upcoming pony DVD (Titled Ponyville Chronicles) available for pre-order at Amazon. The final tally for episodes on the disc hits five, with actual bonus material, though it is unknown what that will actually include.
I'm kind of wondering if this is supposed to mix with the other two Target DVD's that were released earlier in the year. It would be nice to see an actual box set pop up in the future. The bonus material alone sounds good enough for me though!