I also expect a ProForma to be in the S-1/A when it comes out which is where I believe the Valuation of the combined company will be Shown and will in turn Depict the Share Price of the Offering. See below for an links to information.

“Pro forma literally means “for the sake of form” or “as a matter of form.” In the world of investing, pro forma refers to a method by which firms calculate financial results. This method of calculation emphasizes present or projected figures.”

“Pro Forma in Business
In a business sense, companies make financial statements prepared with the pro forma method ahead of a planned transaction such as an acquisition, merger, change in capital structure or a new capital investment. These models forecast the expected result of the transaction, with emphasis placed on estimated net revenues, cash flows and taxes. Pro forma statements, therefore, show the projected status of a company based on current financial statements.

Read more: Pro Forma https://www.investopedia.com/terms/p/proforma...z5XuIoPGGH

This explains the entire M/A Process and where the ProForma comes into to play

http://www.streetofwalls.com/finance-training...echniques/