I know this trailer wasn't targeted at me, but it didn't tell me anything about the distro.
If I had a friend say "I've been holding off on switching to Linux, but you know, that vanilla os trailer really made me reconsider," I would think, that's great...but none of it is specific to vanilla, all of that has been widely available in every Linux distro for years.
Immutable OS' are really cool and are probably going to be the future of Linux desktop computing as they are much more stable and reliable as well as removing a big maintenance burden on the distro devs by shipping most of the software via Flatpaks.
VanillaOS is an immutable distro made by the devs from Bottles.
It aims to be as user friendly and stable as possible, while giving advanced users the option to use their own package manager apx to install every software ever available for Linux.
I played with this a bit in QEMU and I really enjoy the concept but am personally holding off on installing it to bare metal until the Debian rebase comes out. I haven't used Ubuntu in quite a long time but an interim release sounds especially bad to base an immutable OS on.