Makoto Kitayama, editor of the Japanese magazine Rock & Snow, has talked with Tatsuya Muraoka, who repeated Dreamtime last week. Tatsuya says that it must be 8C now. It took him 12 days to do it, compared to the 4 it took him to do The Dagger, 8B+, on the same boulder. Last year he climbed two 8B+'s in Rocklands, Derailed and Madiba. They are clearly easier than Dreamtime.
Adam Ondra made the first ascent after the break, saying it was roughly the same as before in terms of difficulty, but Ondra is Ondra, so the conclusion is that it needs more repeats.