Lots of peds when i did it (that was in 2001). The cases i remember where a 10y.o. diabetic (had to do diabetic teaching and couselling), and an infant with GERD.
I hadn't examined a kid since 3rd year med school (i was a surgery resident) and had no clue. Still got 100% on the exam and the pass was around 60. Not sure how you really can fail that exam (although aparently people do)
mccqe ii is usmle step 2 cs combined with step 3 knowledge base. a lot more practical/management.
some people say the spring session is easier compared to the fall session, i know a canadian grad who failed a fall session (scored 50+) and then retook without much change in study method and scored 90+.
% of peds/ obgyn / surgery stations changes each time. sometimes there are peds questions but no patient in the room and you are interviewing parents.