I've only just downloaded Publisher Beta and my first impression of it is very good, indeed. Keep up the good work! :-)
The first thing I've noticed however is that I can't find an option for hanging punctuation. I don't know if it doesn't exist (in which case it should really be added) or if it's just too hidden (so it should probably be easier to find ;-)
For those who don't know it: what happens in "hanging punctuation" is that, e.g. a line of justified or right-aligned text that has a punctuation in the end, this punctuation mark would be moved a bit further to the right than the letters of other lines, so that the alignment is more visually even.
Admittedly, that's a "pro" feature and not everybody would know how to use it, but as the saying goes: many trifles make perfection.