Developer Aratog Studios claims that Astro Lords is "the first MMORTS to combine three major game genres in a consistent world: construction management, arcade-style shooting, and strategic raid warfare." Gameplay progresses as "players manage and grow their asteroid base, their generals board spaceships to shoot and destroy enemy spaceships and bosses, and they raid other asteroids to loot or capture them." It'll be a cross-platform MMO available both in-browser and within a standalone client.
Astro Lords is expected to enter closed beta on June 10th, with open beta a week later and formal launch on July 1st.
[Source: Aratog Studios press release]