Won’t rule out future deals with 3G Capital.

Miguel Patricio will take over the company after a challenging fiscal year.

The Kraft shareholder vows proxy contest if deal goes through.

The company eyes $80-per-share buyout.

But profitability was hurt in the third quarter.

The $625 million transaction should close in early 2019.

The current executive, Carlos Piani, will remain with the company.

The venture will enable the company to invest in food industry innovations.