so here it is our new chat, as some users already stated. you should be able to change your notification settings in order to set if you want to see notifications for every message sent, if you want to get messages only from specific channel including one such as "private channels" or to not get any notification at all
aside of that, when you click a username either to report him or to whisper him, this shows up:
problem with this is that if you click the username, the actions won't go as they did in the legacy version, not much of a thing but...
other thing is, compared to legacy, you were allowed to copy the chat with ctrl+c and then send it to someone and it'd show the following:
however with the new version if i try to copy the chat it'd show the following:
hour/minutes and username of who is saying it are gone, it's a step back
when reporting someone from chat it should show a pop-up instead of sending you back to the website, but this is more of a suggestion than an error
that's all i found for now