This is something I have tried for quite sometime now under NDA and a Private Preview programme which I found to be really interesting and powerful. This is the ability to embed an existing Canvas App to show up inside model-driven forms. This is now available and really opens up a lot of opportunities for creating pixel-perfect canvas apps that can then be embedded inside Dynamics 365. For example, you can have your Canvas App that reads data from SharePoint, embedded inside your contact entity form. How cool is that!
Image may be NSFW.
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This is now Generally available. Here is the official announcement: