You mean like the "detailed" file viewing mode in windows? Yeah that would be good as well, since it would be easy to sort and organize. However I would personally prefer the ability to quickly identify things through icons. Either way, both of those would be much much better than the gimmicky sounding UI they have now.
I think we definitely have reason for concern. Any mentioning of a PC UI has been vague with nothing concrete, and people often forget that developers sometimes obfuscate or embellish the facts in interviews. And I don't think the "shut up, wait and see" method will accomplish anything either. Best to act now, erring on the side of caution.
Or the ability to switch between them like in Windows.
Anyways, as has been stated, that pretty much sums up the PC as a whole, not just the UI. The only thing concrete about the PC UI is that it'll have hotkeys, as opposed to (or in addition to) the favorites menu. I do agree, too, that it's better to be vocal than just "wait and see." By then, it's often too late.