Yawgatog has mapped the
Oracle changes here:
http://yawgatog.com/resources/oracle-changes/c15-ogw/Basically, apart from the {C} update, the abilities that let a creature block additional attackers are clarified and the trample reminder text is modified to simpler version.
As for the rest, there's a rewording of Erayo, Soratami Attendant and
Homarid and
Tidal Influence get clarification that their "four counters" ability triggers when there's four or more counters.
Golgari Grave-Troll has its creature types rearranged to "Troll Skeleton" instead of "Skeleton Troll" and
Mighty Leap loses reminder text. But there are two functional creature type changes:
Marjhan changes to Serpent instead of
Leviathan and
Shadow Rider loses its Zombie type, becoming just Knight.