Don't think so any LFR player have reached level 15 on their cloak so why bother with that?
You can get your cloak at 15 this week and also get your core, It happened to me today
Did a plain 5 zone run just to be safe, and I got the upgrade.
Confirmed. I completed my rank 15 this week and managed to get a malefic core by clearing all objectives from the HV today.