Keep in mind that with the new UI, in theory, we'll be able to have multiple chat boxes (well, at least 2 were mentioned if I recall).
Supposing they didn't change their mind and this is still happening, I assume we'll be able to select in which window we want to put which messages, which suggests they have probably completely reworked the chat filters section (YAI!)

What should really be coming is the ability to change the font size, imho. Being able to reduce it a bit would allow for more stuff to be displayed on screen.
And I also wish they will allow additional customization in the text colours section. Very useful imho but often overlooked.