Beta 1 RC???

Well when i downloaded the bits of indigo and avalon beta 1 RC, i was kinda confused. How can beta 1 be a release candidate? Or is it going to be just one beta and the next release is the actual version? Things became a bit clear after reading the blog entry at codebetter.
So quoting from the blog entry for anyone who was confused as me:

Beta 1 RC is available - "It's a feature complete version for Beta 1"
Beta 1 for Indigo (the real Beta 1, not the RC of Beta 1) is coming in
"Summer, 2005"