As part of the work on TLS1.3 the TLS working group have decided
to distinguish standards track ciphersuites from others. Some of
the ciphersuites documented in RFC5289 are very widely used yet
that RFC is informational, hence this status-change.

The working group discussed this a number of times as a part 
of their changes to how TLS ciphersuites are categorised. The
decision to go ahead with the status change is documented in
this [1] thread.

[1] https://www.ietf.org/mail-archive/web/tls/current/msg21832.html