I haven't seen anything about this expansion, but it probably won't fit in the same box. It will probably come in a box of the same size as every TE game, and they would probably give a sleeve to put the two boxes together like they did with TEK 2nd edition and Heroes Call expansion
That would be the easiest way to do it i guess. Plus, i have all my cards sleeved, so that takes up more space compared to standard. That won't work. A sleeve just doubles the box size. Done.