Come back to me next year, but I am thinking the name change is because there won't be any more books studied. When was the last time the WBTS actually released what you might call a "meaty" book? Lately the books have been easy material that is meant to be presented in the ministry, not personal study material.
I think what they will do is incorporate what is now part of the Ministry School, the Bible reading, into the Congregation Bible Study. Some portion of the Bible itself will be studied for that segement of the meeting, instead of having someone do a 10 minute talk on it. There may even be an update to the All Scriptures Inspired publication and this is what will be used.
The Ministry School will then focus solely on presentations.
Then the Service Meeting will continue as always.
That's what I think just based upon the "milk" books they have released over the past few years.