I assume when you say "strategy" you mean crowd control. That's a hard question to answer right now for a couple of reasons. We haven't seen any level cap heroics in the beta yet, only leveling content. The leveling instances need to be tuned low so people of varying gear levels can do them successfully. If you have any Wrath of the Lich King raid gear, you're overgeared for the instances. If you have any tier 9 from triumph emblems, you're overgeared for the instances. Just about any group you will get for available content, most of the group members will be overgeared. That's not a great environment to figure out whether crowd control will be necessary or not.
So far, speaking only from my personal experience, most groups will not need crowd control in leveling content. If anybody needs to use more strategy in these groups it will be the tank, because knowing your cooldowns makes using any sort of crowd control even more unnecessary. It's much easier for me to use Shield Wall on a pull I know will be challenging than get my PUG to sort out Polymorphs or Saps. That sort of thing might only be possible due to overgearing, so who knows.
"Has there been any signs of the worgen racial mount yet?"
None. Just about every level 20+ worgen you see in the beta is using a night elf mount temporarily.
"With so much going on with the world leaders these days, what's up with Lor'themar Theron? What is he doing in Cataclysm?"
You know, I have no idea. As far as I know he isn't doing anything at all in Cataclysm. If he is doing anything, it's nothing on the level of the other leaders. He might still be preoccupied with the regeneration of the Sunwell like we saw in the Quel'Delar quest chain and we'll see that culminate at another time outside of the Cataclysm.
"Is it true that Death Knights in Cataclysm will start at level 1 instead of level 55?"
No, there's currently no truth to that. Unless someone knows something that I don't know, they're going to be level 55 in Cataclysm just like they were in Wrath of the Lich King.
Have questions about the World of Warcraft? The WoW.com crew is here with The Queue, our daily Q&A column! Leave your questions in the comments and we'll do our best to answer 'em!