Everything implies, that the situation with marking of chip resistors (0603/0805/1206) will soon be similar to chip capacitors - i.e. no marking on the top of the component. The reason for this step is to reduce unnecessary chemical usages for environmental protections.
Naturally, to identify the product resistance value, each single reel will be labeled with all relevant data as so far. Performance, features, specifications and manufacturing process of these resistors remain the same. So, the elimination of the marking on top of the product itself has no impact on the product functionality and reliability. There will be a short period of time that both types of the products, with marking and without marking, co exist while changing the production lines one by one.

Detailed information: Yageo - Remove marking of RC/AC 0603/0805/1206.