Good video, very much worth watching despite the length. New UI will look something like this:
with an option for a more classic look.
Looks like an enourmous UX improvement too, and a rewrite to QT and eliminating a lot of technical debt will make development faster.
i've never had noticeable lag in audacity besides a niche crash that got fixed. though the cloud storage thing never ever worked for me. it's nice though and you still save locally instead of to cloud by default. plusi think the musehub thing is kinda explainable with the proprietary effects marketplace they added to musehub, and it's not like audacity plugins were always foss anyways