I'd assume it means that the rewards for commenting remain unchanged, i.e.
25% for parent author(s)
25% for the comment author
50% for voters

The Discussion Rewards related to a proposal give a percent of the OP curation rewards to commenters. This would have been in addition to the Comment Rewards above, I think.

There was a proposal to remove the 25% that goes to parent author(s), although I'm not sure of the status of that. I'll take closer stock after this hard fork and after 4th July, as life is too short.