Nope, not yet.
I've got to fix 4.4 WebView issues ("load completely" and "show images" panels overlapping the top of message content), and given that I've got to "ship" this thing at some point, I'll have to go for the easy-but-not-quite-as-good-as-I'd-like option (like in K9 and stock EMail).
That's just a compromise I have to make, to get Exchange support into the users' hands this year (sounds almost gloomy).
But I'd like to fix it the right way too, so that's one possible task for just after the release. Another is that damned side navigation drawer (that also falls into "swipe stuff"), and being able to swipe from message to message (damn, another "swipe thing"). And yet another is this one, swipe actions in message lists. Guess I'll try to work on them all at more or less the same time.