The quest UI has received some tweaks and changes in Warlords of Draenor -- no longer simply a quest log, it has been renamed to the more appropriate Map & Quest Log instead. Hitting L for your quest log will now bring up a new pane which combines both map and quest log into one handy place. You can still hit M for a full sized map, but it almost isn't necessary with this new feature -- the drop down menus at the top of the pane will let you switch between continents, and then sub-zones within those continents.
It honestly reminds me of the current Dungeon Journal UI, which lets you choose between expansions, dungeon or raid content, and then individual dungeons or raids for boss strategies and loot lists. And frankly, this is one of those quality of life changes I didn't really realize I needed until I saw it in action.
Clicking on a quest in the list will bring up the quest text, and the appropriate map for the quest. All information in the old quest log is still here -- rewards, experience, and the ability to abandon the quest if you want to do so. The quest tracker has also received a small graphical update with a new header bar, but otherwise remains the same. Right now, clicking on a quest in the tracker will bring up the old quest log UI, but considering we're still in alpha, that may be changed at a later date. Although it's small, it's a great change as far as I'm concerned -- I honestly didn't realize exactly how much time I spent flipping between my quest text and the map pane until I suddenly didn't have to do it anymore.