You can can install this beta and keep the regular Ui.Vision version, as they both have different extension IDs. This will give you two Ui.Vision icons. No macros will be overwritten.
Please let us know what you think of the UI changes, its usability and e. g. the best placement of buttons in the new user interface.
Note: As the version number is V8.2.701 indicates, this sidebar beta built is based on the previous V8.2.7 version. So it lacks the latest updates of the most current V8.3.2 regular version branch, for example XClickTextRELATIVE | text#R5,12 or SaveItem. Once the sidebar version is ready for a major release, we will of course merge it with the latest update.
Chrome does not support a sidebar for extensions. So “sidebar” here means a small window that you can move around. But you can not attach it to the browser, or even have it inside it (Later, in Firefox, that might be possible).