Bo staff 1 gp 1d4 1d6 ×2 — 3 lbs. B blocking, double, monk
Well then...a double weapon that only has 1 head to enchant? I think I figured out why it's Exotic.
Meteor hammer 10 gp 1d6 1d8 ×2 — 10 lbs. B reach, trip
Meteor Hammer: This weapon consists of one or two spherical weights attached by a 10-foot chain. You whirl the weights and wrap them around an opponent's body. If you succeed at a trip attempt with a meteor hammer, you can drag your opponent 5 feet closer to you rather than knocking her prone. You may use this weapon in two different ways: in meteor mode you use it as a double weapon, while in fortress mode you cannot use it as a double weapon but gain reach and a +1 shield bonus to AC. Switching between these two modes is a free action decided at the start of your turn.
Wait up...this is a 1-headed double weapon, too...and it can change to a reach weapon at the start of your turn.
Are these getting errata?
Over half of the UC book needs either an FAQ or errata hopefully after con season we can get some clarifications.
As Talonhawke said, UC needs quite a bit of errata. For these, though, I'd say it is safe to assume they are intended to have two separate heads, and the omission of the /1d6 or /1d8 is an accident. The developers seem to strongly, strongly dislike the idea of getting the equivalent of multiple enchanted weapons for the cost of a single one, to the point I'd be very surprised if they intentionally printed exceptions. Even if they did, it seems like something that would be directly called out in the descriptive text, not presented simply through the lack of a slash on a table.
That's not the first time that Meteor Hammer was printed like that.
It SHOULD be a monk weapon, since it's a Kung Fu weapon favored by the southern monastic style whose name I cannot spell. 8)
Talonhawke is right, there are some serious issues with a number the weapons in UC.
I'm hoping for a serious cleanup for the Ultimate Equipment Book, which will reprint (and retable) all of the previous stuff. Some consistency would be nice among the the various weapons. This chunkiness is unacceptable in the rulebooks.