So you can rest assured your project will import correctly. (Note if you use third-party addons, you will need to install Construct 3 versions of the addons before importing.)
Third party plugins and compatibility of C2 projects with C3. If I am using Cranberrygame's Cordova plugins in my game (like many other C2 developers who are focused on mobile), it sounds like I won't be able to import that game to C3, with the Cordova plugins in their current state? I will need to rely on Cranberrygame updating his Cordova plugins to make them compatible with C3. Is that the case?
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Many popular addons have been ported to C3. Don't know about Cranberrygame addons though, you will need to research. Also, there is Plugin Converter which you can try, but it only supports runtime 2.
If you can't find Cranberrygame addons for C3, the best option would be removing them from your project, then migrate to C3 and find alternative plugins/addons. For example, there is now a native sharing plugin in C3.
Also, take a look at this massive collection by ChadoriReborn, it's not free, but well worth the asking price: