Sitting at 57 pages so far. I imagine when all is done, it'll be about 80.
The interesting thing is the core rules themselves aren't expanding significantly (though vehicles will take up space of course) though the clarifications and several options in each chapter does add a bit of bulk.
This will be jam-packed with cool things particularly for the campaign players out there.
More sci-fi love is included too since I know it was neglected a bit the first time around.
Hope you're all excited.