Hi Olaf,
We have confirmed the removal steps.
1. Exit the application completely.
2. Drag the app to the trash.
I would assume that you mean "any plans to enable syncing with SharePoint" is for SharePoint Online teamsite libraries or SharePoint On-premise libraries. These are not available on the current version. OneDrive for Business preview client only enables you to sync your Office 365 My Site Documents library to your Mac.
Appreciate your feedback on this.
Thanks,
Chee Loon