Listed in the ad as a 62 page book, Chris at Battlefront has clarified that it will actually be a 72 page book in a thread over on the Flames of War Forum. The available lists appear have been expanded from those available in the original WI supplement.
The Israelis get a tank company, a patrol company, a motorized infantry company, and a paratrooper company. The Egyptians and Jordanians both get tank and infantry companies. The Egyptian infantry company appears to benefit from fortifications. Apparently no Syrians at this point - maybe there will be a PDF?
Regardless I'm looking forward to the supplement when it comes out!