I believe v20 will be quite the large update, given the time it's taken, and I would expect a great number of changes.
Anywho, it really does disappoint me to see people whining about it to come out. I could understand the whining if, like Minecraft at one point, the game DIDN'T WORK PROPERLY. It works perfectly fine, and has content being constantly released. On a tangent for a sec, letting the community release add-ons was a brilliant move. This took the load of making new content off Badspot's back (for the most part) and left the minor job of screening the add-ons.
Bottom line, stop complaining, though it's been said before and nothing has changed. So no real point in saying it again, but it just pains me to see such ungrateful little kids acting in such a way.