So I work for Red Hat and the truth is no one will know until after the acquisition, but there are certainly no plans for that, nor have I heard anyone even discussing such a thing. CentOS is a valuable part of Red Hat and an important part of keeping users in the ecosystem even if they're not paying us, so it wouldn't really make any sense. IBM aren't stupid (despite nonsense that people write online), and Red Hat is a cash machine and they'd be stupid if they messed with a proven model which works.