This appeared earlier today for me 
first impressions are good!
I love that the monthly interest is shown in the pot feeds now, and that when you tap on “total gained” it shows all the monthly interest payments whereas before when you tapped it nothing happened.
I’ve had a few crashes today since the new feed stuff appeared, may be a coincidence though (
iOS 14.4.2, iPhone 12 Pro, Monzo 3.78.0).
Not sure if this is new or not, but I love the haptic feedback when tapping on your sort code or account number to copy it to clipboard in the manage section - it’s very satisfying!