It's really hard to compare the hype for fights these days to the old days, when there were fewer stars, fewer fans, and fewer events. Fights light Fedor/CroCop and Silva/Rampage II had a completely different feel to them, since they dominated the discussion on message boards for years. There were far fewer events and people for people to talk about, so they dominated the imagination in a way that it's really hard for fights these days to, since they have a lot more competition. There were fewer stars, so a larger proportion of the fan base was really invested in one fighter or the other. The only more recent fight that was at all similar was Penn/GSP II, which got its own subforum since the discussion so overwhelmed current events.
This fight will obviously have more mainstream attention, although it won't get as many eyeballs as Kimbo/Thompson or the big Japanese New Years shows. It still has a long way to go to dominate the hardcore MMA discussion the way Fedor CroCop, Silva/Rampage II, or Penn/GSP II did, but it's also a much bigger ask these days than it used to be.