Personally, I really dislike the new icons. For example, the T icon looks too big beside the cube. While the flat look is a big hype right now, most adoptions of it look really bad. The idea behind it is to make it look like a magazine, suitable for a flat screen. Some apps do use it successfully, but to use it you need to know the design rules for typography. Also, the printing press was invented around year 1440, which is not a very long time in the evolution of humans, that spans millions of years. Our brains have not adapted to a typography based layout, and the use of shading to add depth makes information processing much faster, in addition to just looking much better. No disrespect, but the new UI may be a reason for me to not upgrade to version 7.