This is one of the great questions about the next expansion. It's going to be very interesting to see what Ghostcrawler and his team come up with. Because of the restructuring of the trees they did in Cataclysm, they just can't go back and start building them up again, else they'll eventually have to tear it all down again.
My guess is that we're going to see a few more points and maybe one or two horizontal talents come into preexisting trees (in other words, they won't grow vertically anymore). These horizontal talents would be aggressively designed to basically force players in each spec to use them, eliminating the draw of speccing down further in other non-main-spec trees.
The other possibility is that we'll get an alternate advancement system like we've seen in other games, where the current talent trees will remain stable, but another set will appear that players can work in once the main set is filled.
Again, the only person who holds the answer is Ghostcrawler.
What happens if priest casts leap of faith on a target at the same a dk pulls the target with dg? In other words which spell ''wins''?
It can't happen -- one command will arrive and be processed by the server at an incredibly small time period before the other. Whichever one arrives later will win. If by some reason there is a time conflict, I'm sure Blizzard has conditions set in WoW that would resolve it by a roll of a virtual dice or some other measure.
In-game Silvermoon and the Exodar are both generally empty, but are they still bustling metropolises in lore?
They're basically forgotten across the spectrum. Blizzard has referenced that they have lots of their respective races still going to and fro, but that's it. They're essentially inhabited by NPCs, low-level characters, and a few odd people. (Cue incoming deluge of people who say they're using them still.)
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