I can add a couple of words.
The referendum is part of the 2005 Comprehensive Peace Agreement. The countries in the region support the Comprehensive Peace Agreement. It's only natural for neighbouring countries to hope it succeeds. The goal of the agreement is unity.
At the same time, they have undertaken to respect the results of the democratic decision of the people of southern Sudan. That is where the international community—including Canada—must support the process for it to be credible and workable.