No, and it never will be.
Do the panels that you saw have the I-276 shield toward the right of the panel?
If so . . . The signs currently display West/276/Penn Turnpike. (The new southbound ones at the interchange are already up.) There are green patches on the panels where other (future) elements are covered, such as I-95 South and Philadelphia. Within that covered area is the word "to".
The I-276 designation still ends at the Pa side of the state line in the river, but this end will, in a few years, move further west when I-95 takes over the Extension and the eastern few miles of the Pa Turnpike.