Great question @kaca. We’re aiming to for Hestia to be a lightweight and modern control panel with a focus on design, quality, and reliability.
We will be supporting Debian and Ubuntu LTS releases, and plan to have different release paths available for those who want stable, beta, or nightly releases as we begin ramping up our development processes.
The overall interface is currently similar to Vesta, however in our upcoming 0.9.8-29 you will see a glimpse of the new interface that is in the works, with a more condensed view of information.
With our focus on being modern, we realize that a few key areas such as the mail stack could use some improvements and we are hard at work adding commonly requested features like CardDAV/CalDAV/ActiveSync support for Contacts/Calendar and push synchronization on mobile devices plus support in Outlook clients, an updated webmail client that brings this new functionality to an easy to use but powerful interface, and much more.
If you run into any issues or bugs, please submit them to our GitHub Issues page at https://github.com/hestiacp/hestiacp/Issues.
Thanks for your question and if you have any others please feel free to ask at any time.