A new release comes with a simplified bottom bar with only 2 tabs for the wallet and browser.
MetaMask Mobile v6 is now available to everyone! Our biggest release yet fixes issues around slow load times and provides a new and improved UX that gives users more control over their funds and digital identities.
The browser experience improved, specifically in the signing-in process with your Etherium wallets. Apart from stability, now you can easily manage your wallet profiles and it acts in a similar way as user profiles would work on Chrome, helping you to switch between wallets and networks.
📲With the new 🦊 Mobile UI, you can toggle between your wallet and browser with ease. No more searching for the browser tab + you now have more control over which of your accounts you want to connect to dapps.
— MetaMask 🦊💙 (@MetaMask) March 14, 2023
It's like having a whole 🦊 den to yourself! Huzzahs all around! pic.twitter.com/E4NFYmPpWU
This improvement addresses one of the issues that slow down web3 adoption due to a broken sign-in user experience that you would have on web2 browsers. It is not yet clear if a working built-in in-wallet web browser could solve this in a long run but it at least offers web3 early adopters a functional alternative.

Apart from this, an over UI got some improvements and some performance issues being addressed. Some additional data control capabilities got added to the web extensions well.