I love the new UI, but I preferred the fixed and instant tooltip from the previous UI.
The new floating tooltip does make the text more readable, and I do like that, but it also makes it harder when you're say looking through potions to find the right one, and the tooltip box gets in to the way of your navigation. It also makes the navigation difficult because the tooltip keeps moving all the time as you move, so it takes more time to adjust and read the information.
Maybe a fixed option like before that just shows the name of the object you have highlighted when the floating tooltip is off might be a good solution?