Well, according to the interview with Celestia's voice actress, we will be getting more backstory stuff at some point.
Anyways, I'm not sure what to think about this episode. A rewatch will probably do a lot of good, but it won't change the fact that it didn't do the two things I really wanted it to: establish what Luna's been doing this whole time between s1e2 and here, and at least somewhat establish her relationship with Celestia.
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http://backloggery.com/genesistwilight/sig.gif
http://h4.abload.de/img/hghdeadpoolbth7.gif