In an email newsletter to developers, Salesforce.com announced that a REST version of its API is on its way. While Salesforce is yet to provide details into this enhancement, the newsletter acknowledged that it will enable "simple HTTP and JSON as a possible output format, to make integrating with Force.com fast and easy."
Simple it is, as the ease of development in REST has resulted in REST API usage growing immensely in the past two years, taking a good byte out of SOAP API usage, on which Salesforce.com's API is currently based.
Salesforce.com will launch its REST API on October 26th as a developer preview. Registration is open to join an introductory webinar that day.
Update: In the comments, Salesforce's Jon Mountjoy pointed us to a sneak peak of the API with a video (embedded below).