all deals whether a partnership or acquisition have NDAs. they are usually exclusive with a 90 day expiration date . my point on the NDA is they usually don't freeze all communication, such as PRs regarding their products or services .For example it would be questionable if they had a clause that says "if NASH results exceed expectations, all information regarding that data will not be announced until after the 90 days"..That potentially borders on an SEC violation about material data in my opinion...
the NDA is focused on the relationship between the two and if the deal blows up they cannot share that information and usually require destruction of specific documents etc. at least the deals i have been involved in