Xiaomi is about to launch an 'exclusive version' of the Xiaomi Redmi Note 4 that will come with 4GB RAM and 64GB internal storage. Compared to the current version available in China, this is a competitively-priced upgrade.
http://www.notebookcheck.net/Upgraded-Xiaomi-Redmi-Note-4-will-launch-tomorrow.205378.0.html