Locale-adaptive pages change their content to reflect the user's language or perceived geographic location. Not all content variants of locale-adaptive pages may be indexed completely. Google has introduced new locale-aware crawl configurations for Googlebot for pages. Depending on how the content is served based on the request's language and perceived location.
1) Geo-distributed crawling - To use IP addresses that appear to be coming from outside the USA
2) language Dependent Crawling - Crawling based on the accept language HTTP header in the request
Users will not be required to alter their CMS or server setting. These new crawling configs are enabled automatically for pages which are local adaptive.
Source : Google Webmaster Central Blog