I actually don't think that the kernel was automatically updated during the install.
I ran a "normal" update directly after the install and then it was updated. Together with a lot of other stuff.
And I didn't get any errors popping up. Might be some in the logs...
I'll do a new install on a HC2 tonight, I'll look especially for what kernel is running after the initial install (and after a reboot, for good meaasure).