Part of Scotland's bid pitch was to bring in as many countries as possible. We had entries from 51, though not all of them showed up, partly due to visa issues. I think this was a record, so the problem isn't with the new format.
So compared with last year, there was some consolidation within Europe,
Women - China, Japan, Slovenia, Portugal + Belarus
Men - RSA, China, Slovakia, Korea + Turkey
(30 women/34 men) http://www.woc2015.org/print/relay-start-list