No changes soon
There will probably be no changes very soon. Pluto has been under the gun, discussion-wise, by the scientific community because of its quite small size. A couple of decades ago they found a "Plutrino" between Saturn and Uranus and called it Chiron. Then they found a few more small bodies in the Kupier belt -- followed by (now) several thousand! They have now exceeded the number of countable asteroids (from a 1/4 mile in size and upwards) and are merely being numbered. The end result is that you can rationalize including a new body every ten or twenty years, perhaps, but you can't make any kind of a case for adding bodies by the hundreds.
Where does astrology end and absurdity begin? For me, there is a broad line between the two. I use the standard bodies -- Sun, Moon, and the planets out to Pluto. I don't bother about asteroids although I know of and can appreciate what their advocates say and demonstrate. I don't bother about Chiron or any of the Plutrinos, Centaurs or other objects. And I don't see my "astrology" hurt or limited at all. Although I am biased, I believe my use of astrology is better than most of what I read elsewhere.
Especially for early-studies students, I would not worry about Chiron or Zena or who-ever for some time. There is always time later, once the basics are understood, to explore all of the extra stuff. My opinion. But, bottom line, things are becoming so confusing that I don't see the scientific community or the astrological community coming to any consensus for many years. Dave