Austin Carr, on bloomberg.com:
A grid of buttons pointing toward favorite destinations remains glued to the top of the panel. Each of these services operates more like a desktop app than a web page. Clicking the Gmail icon will take the user back to a single, original Gmail inbox, rather than reloading gmail.com in tab after tab. Hovering the mouse over a Google Calendar button will surface a tiny panel of upcoming appointments. Spotify comes with an embedded player to shuffle through songs. Any tabs opened throughout the day appear at the bottom of the panel and—this can take some getting used to—are automatically set to close and archive in 12 hours.
Article has the first clear screenshot of the Arc browser. I really like how it looks. Went back to using Vivaldi with side tabs as I eagerly wait for my invite.