The grid is now 14 x 15 land squares. I think, confirm that by looking at the diagram someone posted here.
If you are focused, you can see the repeating pattern in the mountains along the left. And, you can see repeating in the pattern on the beach as well. The seaweed.
I counted the patterns to find the right side corner of the intersection of the 7th row and column (14x 14 when I did it) of land strips and placed my Jebediah statue there. That's how I got my town square dead center. You should now go the intersection of the 7th row and 8th column.
But they added a strip and now I can't buy the new land without ruining this effort.
So, don't knock yourself out finding center. It will move if they add land.