http://steamcommunity.com/groups/EarlyAccessGuidelines#curation


1. Timeline: Provide a general idea of the length of time in which the game will remain on Early Access, the minimum update frequency and expected date for Full Release.

2. Define Abandoned Projects: Define limits to establish which titles may be removed, recategorized or flagged from the Early Access Game platform in order to foster and market products that actually remain in development. Exemptions in length of Early Access period can be provided for particular genres or games that have fulfilled the guidelines for a determined period of time.

3. Build Rollback and Changelog: Each official version of the game released is available to the customer, to make use of it as he/she wishes. The version that you enjoyed and based your purchase on will always be available. Additionally, a "Build Changelog" will be available on the Steam store page, in order to provide transparency in update frequency and content.

4. Monetization: No additional paid content to be offered during the Early Access period, unless the game is Free To Play. If additional paid content not included in the base game price will be offered at some point, plans are to be disclosed at Early Access launch.

5. Developer commitment is to be incentivized by not allowing additional products to be launched in the Steam Store by the same developer until the Early Access project has been completed.

6. Refunds: Players will have the option for "No questions asked" refunds if the project does not fulfill the Early Access Guidelines.

Suggested Guidelines for Early Access platform

Steam Early Access