Races & Classes details from the WotC boards

[JohnSnow]

Unless you think of "stars" in terms of Cthulhu-type "dark old ones that dwell in the stars beyond" type thing.

Maybe they decided that Cthulu-type "dark old ones" are more appropriate as a paragon or Epic level path available to Warlocks. So there's 3 to start with, and the "Star" pacts are available only after you reach higher, somewhat more appropriate (assuming you're not running a horror campaign...), levels.

But that's just wild speculation on my part.

 

[pawsplay]

"Stars" in the Book of Exalted Deeds refers to the cults inspired by the arch-angelic powers.