Possibly VERY spoilery NPC popping up on 25th Century ESD

I was running around ESD and happened to spot a very unexpected and probably very spoilery character sitting in the little lounge area to the far left of the Spacedock NPCs, near the turbolifts. When I clicked on him, it identified him by his correct name. I ran around seeing if any other anomalous characters were running around, but didn't see any. When I came back to where I'd seen him, he'd been replaced by a standard NPC engineer or some such. So imagine my surprise when I went into the Exchange and saw this: http://imgur.com/HYqHZzA

Best I can tell, he's randomly popping up in place of NPCs who beam in and out occasionally. Super excited to see him and wondering what it means, but I suspect he's not supposed to be there.