I think it would be AWESOME if the end date of an event would automatically change to the start date when the start date changes.
In this example below, once I choose the future date to start with, the end date should jump forward. This would help save some clicks when creating an event (depending on how far out the start date is). Perhaps the default could be one hour after the chosen start date.
By the way, I think I may end up missing the time sliders from the old version. But maybe not. I like them both.