It's always possible that the USGA and R&A have called a joint press conference to announce there will not be a ban on anchoring - there's been so much attention to this subject, and to the governing bodies' mulling over a potential ban, that letting golfers know there will be no change is worthy of a big announcement.
But probably not. What is likely to happen on Wednesday morning is the announcement of a ban on anchoring. Not a ban on length - belly putters and long putters will still be legal to use; only anchoring those putters (or any other clubs) to the body in order to stabilize them is what will be banned. Such a ban would, still, render long putters obsolete for most of the golfers who currently use them.
It's important to note that if, in fact, an anchoring ban is announced on Wednesday, it wouldn't go into effect until 2016, when the next update to the Rules of Golf are scheduled to be published. And that's assuming that any such ban survives the lawsuits that are being threatened by some professional golfers who currently anchor belly or long putters.