Re: Klingons in STID--why do they look like [SPOILERS]?
The appearance looked similar to the Excelsior's long-range sensor image of Praxis from the Prime timeline. There were differences, but even Qo'noS itself hasn't been depicted in completely consistent terms since the very first time we saw it on TNG during the third season of the series.
I'm going with "that was Praxis" unless we read otherwise from the producers.
Remember what cooleddie74 says, kids:
"Don't forget to have a Patrick Swayze Christmas!"