multi-queue-ethernet-default

I noticed this new queue types since v5.6? (mq pfifo)

What is the difference between this and regular pfifo and what is the recommended usage for it?

/queue type
set multi-queue-ethernet-default kind=mq-pfifo mq-pfifo-limit=50 name=multi-queue-ethernet-default

They talked about it in the 5.7 patch notes thread a little bit.
http://forum.mikrotik.com/t/routeros-v5-7-released/50130/10

Thanks!