Now let's not bicker and argue about who killed who and stole their stuff. WoW and D&D have a loving relationship going back many years. WoW was born from D&D, and as children often do, grew beyond the expectations of its parents. Years later, we see D&D borrowing clothes out of WoW's closet in an attempt to look modern and appeal to the gamers of the 21st century. Only time will tell if D&D can get away with this, or if it just looks silly trying to wear something that's not suited to anyone over the age of 30. Like enormous spiky shoulder armor and weapons large enough to serve as a buffet table.
So while WoW owes it's very existence to D&D, the reverse isn't true at all. D&D has borrowed a lot of window dressing, artwork, and a few concepts from WoW, but overall the games don't play anything alike. I have played both of them for years. If I could get everything I want out of either game, then there'd be no reason to play both.
The similarities are in some of the artwork — the Linked Portal ritual picture comes to mind. It's virtually identical to the Portal spells in WoW as far as the imagery. Dwarves look more like they do in WoW, and a lot of the Eladrin art I've seen is strongly reminiscent of blood elves. Big shoulders are in for this edition of D&D, just as they always have been for WoW.
Another point that screams "WoW" to me is disenchanting. "Gee, no one can use the +2 spear of Fish Summoning, looks like we'll have to shard it.". There's no basis in D&D history for DE'ing items. It does provide a convenient solution to letting the players "get" every bit of treasure they pick up without having to make choices as to how many golf-bags full of weapons they are going to try and carry up the rope ladder out of the dungeon. I'm not sure I like that. I'd rather the players make the agonizing decision of what to leave and what to bring out with them. Then they face trying to buy and sell items without devaluing the local currency by flooding it with enough money to purchase a moderate sized town. Disenchanting feels like a copout to me, and WotC didn't even bother filing the serial numbers off when they stole it from WoW.
Some of the 4E powers do have a lot of WoW flavor to them, to the point where I find myself using WoW names for them as a joke. My son made an elven ranger, and I was teasing him about his wing clip and hunter's mark abilities, and kept calling him a hunter. So yes, there are similarities there for those who want to find them. That's okay, parents and children have a lot in common.
WoW for me is about raiding with my guild, running quests with my kids, and enjoying the stunning artwork. D&D is about roleplaying with my friends and creating an interesting story. Sure we get to kill bad guys and take their stuff in both games, but the way they feel in play is very different to me.
So 4E is running around with armor out of WoW's closet, and stole their dwarves and
blood elves eladrin. I'm thinking that will be okay, but plan to make a tally sheet when I run KotS to count how many times my players complain, "That's like WoW!"