The listing says it will be out on April 12th (this week!), but I believe they are mistaken. The last I heard, the disc is due out this Summer, probably in July.
Here are the links for the Blu-Ray and DVD editions:
Battle Beyond The Stars [Roger Corman's Cult Classics] (Blu-Ray)
Battle Beyond The Stars [Roger Corman's Cult Classics]
If it turns out that Shout! is indeed stealthily releasing the title this month, and any of you Space: 1970 Star Kids actually get your hands on it, please drop me a line. Battle Beyond The Stars is currently my most-anticipated forthcoming Blu-Ray release, and I'm sure I'm not alone.
UPDATED 4/11: Just updated this post with a large scan of the Blu-Ray packaging.