I accidentally stumbled upon this thread and downloaded 6.8 Beta 2 and can confirm italics prints out properly, but I see what you did there...
Print preview is being faked by automatically creating a PDF to display. Printing from File has a different output than printing from Print Preview as far as kerning, character height and word spacing, even boldness of italicized characters. But, both ways do not cut off italicized characters, put the underline through the words, and allows highlighted text.
Knowing this is Beta and not public release, we're cool. As a paying subscriber, I feel I would be remiss if I did not mention that because Evernote PRIMARILY is a note taking app, the fact it took 7 years to prioritize properly displaying and printing the notes created within Evernote apps seems to be a bit negligent and amiss from the spirit of the thing. Notes are the thing. Focus on doing the thing well, then bring other things aboard, but don't neglect the thing.
I'm not bitter. This is better. Thank you for fixing it. God bless us, every one. </rant>