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I can't help but get the feeling that WoW's panda expansion is copying ideas from GW2. I'm not talking about everything but there are certain abilities that stand out.
Warriors, in particular, will get a war banner when the class never needed or required such a tool. It brings nothing new to the class as certain abilities were removed so their functionality could be given to it. Some could even argue that this ability is worse as it's a static buff/debuff that must be directly placed on the ground.
The warlock's lvl 87 spell is practically the exact same thing as the mesmer's portal. Think about how the mesmer's ability works and then read this tooltip description. "Creates a demonic gateway between two locations. Stepping into the gateway causes any party member to be instantly transported to the other gateway." They're the exact same spell!
The hunter's new powershot talent, while not exactly gamebreakingly hard to conceive, is the ranger's long shot which deals damage based upon the distance between the caster and his target.
Similarly, the rogue's new blanket invisibility reeks of the mesmer's veil ability. Rogues are masters of silence and perfected that ability themselves. How, though, would a rogue instantly silence and hide a heavily plated and clunky character like a warrior? Now think about how they would instantly cloak a dozen warriors at the same time... It just doesn't make sense, If they used magic then maybe, but they don't and that's the reason it's a believable ability for a caster like the mesmer.
I could keep going but I feel this is a good stopping point. Some of the other abilities they've released share a similarity but differ overall while others simply haven't been revealed yet.