Here is one possible approach:
1. Let's save your app's current published version is 1.
2. You have made some changes and the current version is 2 (unpublished).
3. You don't want to publish version 2 as it will get rolled out to everyone.
4. Open the app and choose Save As.
5. Give it a diff name and save it.
6. As soon as you save it, it gets published.
7. Share this app with the select users.
8. Once you get their confirmation, you can publish version 2 of the original app.
Let me know if this helps.
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Hardit Bhatia
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