Dear friends, consult a few questions about DMX5：
1.I want to modify the home page interface of DMX5 for the personalized interface I want, such as adding the header and footer, I don’t know how to modify it?
2.How to add new role types in DMX5？
3.When is the official version of DMX5 expected to be released?
4.Does DMX5 have any killer applications now?
5.I like this software very much. Will DMX5 stick to open source all the time?
I have a lot of questions. Thank you for your patience！
1.I want to modify the home page interface of DMX5 for the personalized interface I want, such as adding the header and footer, I don’t know how to modify it?
You could develop a plugin that extends the DMX Webclient. There are the mount points e.g. toolbar-left and toolbar-right where you can plug in Vue.js components. As an example see how the Workspaces plugin adds the workspace selector to the toolbar: https://git.dmx.systems/dmx-platform/dmx-platform/blob/master/modules/dmx-workspaces/src/main/js/plugin.js
In the future the DMX Webclient might provide additional mount points.
For starting a plugin development project see this post: Develop a DMX plugin
2.How to add new role types in DMX5?
Creating role types interactively in the DMX Webclient is not yet supported (in DM4 it is). I’ve created a ticket: https://git.dmx.systems/dmx-platform/dmx-platform/issues/207
It will be supported in the upcoming Beta 3 release.
At the moment role types can only be created by plugins. Tell me if you need more info.
3.When is the official version of DMX5 expected to be released?
The stable DMX(5) release is planed for later this year.
But you could start with plugin development today 
4.Does DMX5 have any killer applications now?
Several (DM4 + DM5) applications have been developed and are productive partly since more than 10 years. Some of them are showcased at https://dmx.berlin/case-studies
I leave it to the DMX marketing people to add to this answer
5.I like this software very much. Will DMX5 stick to open source all the time?
Yes, definitely!
The platform itself will always be licensed under a free software license. GPL3 at the moment, AGPL soon. Also there will be dual licensing. Plugin developers are not forced to distribute their plugins under a free software license. If you want deploy a proprietary plugin you’ll need a commercial license.
I have a lot of questions. Thank you for your patience!
You’re welcome!
Dear jri, your reply has solved my problems. Thank you!
Creating role types interactively is now possible:
You can try out at our dev server or download the snapshot.
https://dev.dmx.systems
https://download.dmx.systems/ci/dmx-latest.zip