A new feature.
A fix to an old bug.
An idea for something new that you want to see whether there is some love from the market to keep it going?
A direction you never thought of.
A new platform of support.
What should never be in a preview?
Making your application harder to use then it was before.
Putting your users through 5 clicks to accomplish a task that used to be done in one.
Having to call support to fix an issue that wasn’t included in the preview and now they are stuck with.
Cloud platforms are updated daily, some even hourly, so much so that the documentation that supports them cannot keep up.
Making your customer work for YOUR preview only helps you, not them.
Don’t put them through that pain, it’s not worth it.