What happened to updating more champion splash arts?

Syndra, Jayce, Varus, Darius, Lulu, Evelynn.. These champions are older than Rengar, yet Rengar had his splash art updated. I know some champions still need their splash art updated yet are newer than Rengar, and I know some are in the process of being reworked, but those champions I've listed see some play here and there at least. What has happened to the waves of updating their splash arts?
Report as:
Offensive Spam Harassment Incorrect Board