What we have here is video from today's Korean press event, showing footage of an orc warrior playing both on the Timeless Isle in the starter gear you get when boosting to level 90, followed at the four minute mark by a dwarf warrior running around Shadowmoon Valley on Warlords of Draenor's Draenor. We get to see the maps for several zones (most appear to be unfinished) as well as Draenor's position on the map next to Outland and Azeroth. We get to see several mobs, including a nether ray style mob, and the local draenei at the Temple of Karabor. Even better, we get extremely brief glimpses of new level 100 warrior talents!
All in all it's pretty tantalizing, and perhaps they're further along than I would have thought - it seems more likely to me now that a beta is a month or two away than it did before I saw the video.
Edited to add - The folks at MMO-Champion posted two more videos from the same source, Korean webzine Inven. You can watch them here and here.
Thanks to Mintie for the tip.