Im very excited about this new product! a few quick questions...
Is there a way to show interactions that take place on one page without having to create a new artboard? For example, could I show what the choices are on a dropdown when a user clicks into it?
Also, is there any way to show hover effects?
If you mean something like this: Animation Support (microinteractions) – Adobe XD Feedback : Feature Requests & Bugs then it's in the backlog (and you should go vote for (and add your good ideas to the comments on) it to lend your support.
If not, there may be another closer match on adobexd.uservoice.com, and failing that, you can add your own :-)
I'm (we're) glad you're enjoying it so far.