When copying/moving a file or a set of files, typing in the destination will show an incremental list of matches as you type. This existed in v7.5 but in v8 betas, matching directories now have a backslash "\" appended to avoid the confirmation dialog of accidental renaming (neat).
There are now two bugs in my opinion:
1.
With the backslash, a matching folder appears after a matching file instead of before. Here's an example. Suppose I have this folder structure in some folder x:
[folder] bad
[folder] good
[file] good.ash
[file] foo.txt
[file] bar.txt
If i press F6 on "foo.txt" and then I start typing "good" then the inline list of matches shows
good.ash
good\
It would be much better to have the matching directories first and then files, like so:
good\
good.ash
This is because I got very much used to pressing F5/F6, then typing a few characters of a known directory and then press "down" once and then "Enter". Now if I do this, it will try to rename the file since the first match is NOT the directory. I do this quite a lot and it used to work fine in v7.5 but now with the "\" for dirs it doesn't ... it's a bit annoying (I wouldn't take the time to post this otherwise). Please do change this

2.
When marking/selecting multiple files and then pressing F5/F6 for copy/move and then typing some characters in the destination text box, it matches both files and directories. For example, if I select both foo.txt and bar.txt and then press F5, then type in "good", the match list will show
good.ash
good\
It would make more sense and be more efficient to show only matching directories since you can't copy/move multiple files to a single file anyway. So the above should really show only:
good\
That's about it. I like the new v8 features otherwise.
Cheers