I'm really not surprised that blizzard

Honestly, I'm really not surprised that blizzard is making an expansion based around old characters that already died and a story that is coming completely out of left field that will likely have minimal effect on the overall plot.

I mean, there's not much story left out there. There's N'zoth & the naga (I imagine blizzard is a little nervous about making an underwater expansion due to the severe backlash from Vashj'ir) and the Burning Legion with Sargaeras. That's really it.
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Now they could create something new but the last time they did that was MoP and a large portion of the community blew a gasket and ignored all the excellent story to make lame jokes about kung fu panda and disney panda land. It's much safer to make the new expansion on something already done than to risk making something 100% new again.