It's that time of year again! Spring is moving to Summer and I want to get ahead with testing out Summer '18 release features. I've heard talk about pre-release orgs being available but I can't figure out how to get my hands on one. What do I need to do to qualify for a pre-release org?
If you already had an existing pre-release org its now on SUMMER 18. You can log in and check it. As Spring 18 pre-release program is closed(https://www.salesforce.com/form/signup/prerelease-spring18.jsp), you won't be able to create a pre-release org.
Summer 18 pre-release program has not been started yet(Page does not exist) https://www.salesforce.com/form/signup/prerelease-summer18/
Keep an eye on above link to you will be able to create new pre-release org.
I believe you can raise a case to get a pre-release org or wait for your sandbox to get SUMMER18.(https://www.salesforce.com/blog/2018/04/summer-18-sandbox-preview.html) .
Edit: if you stumbled upon this the pre-release org is available
Generic links that will work for all the releases in the attached document.
Timeline Document - https://trailblazers.salesforce.com/0694S000000ftoM
Pre Release Org - sfdc.co/RR-Pre-Release