Here are 3 Dev Diaries. Yes, 3! It has been a long time since we have seen /any/ Dev Diaries.
The first is from QuartermasterU ..."Update 16: The Ashes of Osgiliath".
https://www.lotro.com/en/u16
This one, by Ben Schneider and Frelorn, is on the New Instance Cluster.
https://www.lotro.com/en/game/articles/new-instance-cluster-developer-diary
This one , also by Frelorn, is a general overview of the newly introduced Imbuement System.
https://www.lotro.com/en/game/articles/legendary-item-imbuement-dev-diary