So, with the opening of this interchange, I'm guessing MassDOT wants motorists to take the new Exit 25 to reach the "Route 128 Station". That seems to reason that any reconstruction of the I-95/I-93-128 interchange would involve a flyover coming in to the left at some point near the present University Ave exit on I-95/128 North.
ConnDOT recently added a 2-lane left exit flyover on I-91 to reach the Charter Oak Bridge in Hartford... I wonder if something similar could be snuck in, coming in on the left side of 128, shifting the existing 4 lanes over to the right to accomodate such a ramp. The farthest lane right could become an "Exit only" ramp for University Ave/present Route 128 Station exit. Certainly leaves the door open for such a configuration, and with this ramp open, there wouldn't be a need for I-95 North traffic to access University Ave via that exit... instead, that traffic could take this new exit.
But that's all probably several years away, given the present big ticket interchange items ongoing (I-90/I-495, I-90/Allston Viaduct, etc).