First of all: Hi, long time lurker (since 2014 and my first HHN), first time poster, so please don't flame me too badly!
I think this is actually a pretty inadequate analogy, it's not so much that we don't know who's playing, more that we don't know what they're playing - which is usually the case with gigs.
We know that it's the same guys that gave us a good HHN26 and a great HHN25 (purely imho ofc) so personally I'm giving them a little faith. That said, in an increasingly social media savvy age, where innovative marketing, viral engagement and massive competition abounds, Universal's efforts have been pretty lacklustre.
I guess what I'm trying to say at 0030 halfway through a 12 hour night shift (so please forgive my incoherency) is that a poor marketing campaign doesn't necessarily equal a poor event.