Why is CAMELLIA suddenly so widely used?
The reason why you see that is because Camellia is the highest-preference cipher in NSS (Chrome and Firefox).  Servers that support Camellia and use the client-preferred cipher suite will use Camellia.

NSS's rationale for this ordering is:


  National ciphers such as Camellia are listed before international
  ciphers such as AES and RC4 to allow servers that prefer Camellia
  to be able to negotiate Camellia without having to disable AES
  and RC4, which are needed for interoperability with clients that
  don't yet implement Camellia.


See also: Bug 430875