Is there any blog and / or link where I can get regular updates on the release of latest open data sources across world?
There are two additional options here.
- If you know of an open data portal for a country or topic you are interested in, many allow you to subscribe to their data updates or releases.
- If you do not know that a source exists and are looking for one, several aggregator sites are referenced in a recent answer to your related questions on international aggregators for NGO data. Additionally, on Data.gov we track official government open data portals, and I can certainly look into creating a subscription feed there.
Check out http://databullet.in. It's operated by Knoema/The World Bank but aggregates data releases as they occur from about two dozen different sources.