Not exactly new-there are a bunch of little bug fixes requested
I know what you mean about tab-in calendar quick add it skips over all the actual field options, and I think in both places it skips over the time section.
Same for the cursor-doing a quick add/double click etc (not the ~ and not the normal 'new' button), forces me to click the subject and use my mouse for every action.
I do notice border differences and what not on themes
CSS is handled differently for IE vs Firefox VS Safari
Safari is a little behind all together-solutions are being worked on-but it's especially dysfunctional in the calendar.
I'd be interested to see a detailed list as well-but I don't have the time

(be sure to start with a cleared cache every time!)