While Windows Insiders can already get their hands on a preview version of the new Paint 3D app that is coming with the Windows 10 Creators Update, a similar preview for Mobile isn't yet available. However, Windows Insider head Dona Sarkar has confirmed that a Windows 10 Mobile version of the app is in development, and is currently in the alpha stage.
When the Creators Update was revealed at the Microsoft's October Windows 10 event, Windows 10 Mobile didn't fetch much attention, so the status of a Paint 3D app for the platform was a bit of a mystery. While there's no word on when we can expect a similar preview for Mobile to be available for Insiders, it's good to have public confirmation that it's being worked on. Expect the Paint 3D app for Mobile to eventually make its way out to Insiders with a future Creators Update build.
In the meantime, WindowsBlogitalia (via WinBeta) appears to have obtained a look at what the mobile Paint 3D app may look like. It's unclear if this is a mock-up or a genuine screenshot, but you can take a look in the image below.