@ramesh sky bro, no idea which part you are talking about (guidelines/chat) but nothing new on your picture. They are all old things. Live chat available from so long for live videos.
Use voice search within the YouTube app when casting to your smart TV – available on Android & iOS mobile devices. We hope this new feature allows you to more easily search for your favorite YouTube content on your TV.
More features to give you more control of your experience
We introduced a new “Who’s Watching” feature that lets you now switch between different YouTube profiles linked to the device you’re watching on, so everyone in your household will be able to access their own personalized recommendations, subscriptions and catch up with their favorite creators. Note: if you try to cast or open the YouTube on TV app twice during the same day, you’ll be defaulted to the last account you were signed into.
You’ll see an updated navigation menu that displays on the left hand side of your screen, making it easier to access your favorite pages like music, news, gaming, and more! See which account you’re signed in from in the top-left corner, above the menu.
Expanding YouTube’s on TV support to more devices and screen resolutions
Earlier this year, we launched the official YouTube app on Amazon Fire TV devices, giving Fire TV users access to a diverse library of video content including music, how-to videos, entertainment, news, gaming, and of course, all your favorite YouTube creators. The official YouTube app also works with Alexa, making it easier than ever to watch all your favorite YouTube videos on Fire TV.
We’re excited to announce that you can now watch YouTube in HDR on PS4 and PS4 Pro, too! This feature will allow you to enjoy your favorite HDR videos with more vivid colors and contrasts.