It ain't over til its over
"The Arrangement Agreement provides that the board of directors of Kaminak may, under certain circumstances, terminate the agreement in favour of an unsolicited superior proposal, subject to payment of a termination fee of C$20.3 million, and subject to Goldcorp having the right to match the superior proposal in question. Kaminak has agreed not to solicit any alternative transactions."
Personally I already own shares of Goldcorp and not really keen to have that much more. So I am waffling between selling now and putting the profits into some other play like Victoria Gold (similar to KAM, but grossly undervalued compared to KAM - do your own DD) or... hanging on till July 14th to see if somebody else decides to put a bid in on KAM and maybe starting a bidding war.