Spore's September 7 release date, VP of Marketing at Maxis Patrick Buechner has told IGN that both trial (free) and retail (premium) versions of the creature editor are coming in June. The trial version will be available for download and in The SimCity Box, while the retail version should be available in stores around the same time Box launches.
"The free Creature Creator has about 25-percent of the creature making parts from Spore. The retail version will have 100-percent," said Buechner. Any creations you conjure can be shared online via the upcoming Sporepedia, and they will be compatible with Spore once it's released. No price was given for the retail version, and it wasn't mentioned whether any discount would be given to those who pay a premium to be teased about Will Wright's evolutionary time sink.