Mention the changes in the SSH handling in the NEWS
file.

Signed-off-by: Helga Velroyen <hel...@google.com>
---
 NEWS | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/NEWS b/NEWS
index 8cf1f55..65c6d0d 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,23 @@ News
 ====
 
 
+Version 2.13.0 alpha1
+---------------------
+
+*(unreleased)*
+
+Incompatible/important changes
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- The handling of SSH security had undergone a significant change. From
+  this version on, each node has an individual SSH key pair instead of
+  sharing one with all nodes of the cluster. From now on, we also
+  restrict SSH access to master candidates. This means that only master
+  candidates can ssh into other cluster nodes and all
+  non-master-candidates cannot. Refer to the UPGRADE notes
+  for further instructions on the creation and distribution of the keys.
+
+
 Version 2.12.0 beta1
 --------------------
 
-- 
2.0.0.526.g5318336

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