Of all the components in the group, the cranks likely changed the least. Why fix something that isn't broke? By getting rid of the spider, they were able to drop 100g and maintain the same strength. Note that you can only get these bad boys in a single-ring from now on. $439.99 / 919g (or 931g for 83mm).
The new Saint SM-CD50 chainguide that we first saw at Sea Otter wasn't available yet. In fact, there is still only one or two in the country and it sounds like they're still testing it, so don't hold your breath.
First Look: Vital's Pre-Production Shimano Saint Equipped V-10 Carbon 0 of 20