Kirin has made changes to its Ichiban Shibori Beer packaging in Singapore is will give six packs to a few selected followers who spot the four differences. If you live in Singapore, you might want to check out their Facebook feed. There are already lots of guesses in the comments. キリン
It looks the the changes are as follows:
1) Kirin Original Brew to Kirin Prime Brew
2) addition of alcohol content 5%
3) addition of the Japanese indication of alcoholic drink お酒
4) a font size and color change.
Photo is a web capture for explanatory purposes, copyright belongs to the company.