In version 2.0.3, the plugin is not using a deprecated method of registering the widgets. So what the author says in the topic you linked, is not the case here. In fact, it uses the same method of registering widgets as other, supported, plugins do.

The only advice I can give you is to contact the author of Dynamic Widgets, and ask him about it. Like I said, the plugin is using the correct way to register widgets, and the new version will use that same method since there is no other way to do it.

I can’t give you a date, but it is still in progress.

Currently work is done to get the server ready for some cloud features that will be implemented (more details on that will follow). After that there will probably be one more alpha, then a beta and depending on how things will go with that either one more final beta, or a release.
That is basically the plan, keep in mind that this might change though.

Development is going a little bit slower then planned, but it is still going on!

Advanced filters have been added, which allows custom form validation. This means that it will be possible to require a minimum message length for example.
Also a base slug has been added, which should fix the problems in the previous alphas that posts are not accessible.

Various other bug fixes and improvements have occurred.

I can’t give you a date when the next version will be released, but I think the last alpha will be pushed soon.