Pretty much the same as 6.x-1.0-alpha1, so go and take a look at that the release info text of that one before reading on. Note that this is still *alpha*, and thus can change anytime in any ways (be prepared to clear your caches), and can also break your system, eat your children and seduce your fiancees.
alpha1 had the not so nice feature of denying uploads for every user that is not user 1, which is the main reason that I'm doing an alpha2 so quickly. The other reason is that we're pretty much on par with FileField 5.x-2.x, at least concerning features (but disregarding bugs). hook_filefield() is still missing, but everything else exists with similar or better functionality. (Apart from the reminder message "Changes are not permanent until you save this post" - need to consider if we still need this at all.)
Improvements compared to alpha1, shamelessly stolen from the porting issue:
- Major new feature: Let users upload even if they are not user 1! (That is, I fixed the permission name in hook_menu().)
- Edit widgets (the thing with the icon and the description textfield, but not "List" and "Delete") are now always encapsulated form elements. That's a change for developers only, of course.