Thats interesting about Chinese NY. We usually go to Niseko first week Feb and were planning to do the same this year. I do not fancy sharing the accommodation and resorts with more people than usual though so may go last week of Jan instead. When did Chinese NY fall this year? Does it vary much? If it was around early Feb this year then we didn't notice larger numbers.
In 2013 CNY is the week of 11 February (actually Sunday, 10 February, is the first day of new year), which is smack in middle of high season
In 2012 it was the last week of January (Monday, 23 January, was the first day of the new year).