• There's no way answer what you are asking in a few sentences or a post. Latency will depend on the load you're moving across links and the bandwidth. You need to measure what you're getting, and probably get help from a paid consultant on specifying the links and capacity you need.

    In terms of moving data to new databases, if you have some sort of ID or marker per country, you can easily partition the data being sent across replication by specifying a filter for the publication. http://technet.microsoft.com/en-us/library/ms151775.aspx