Katherine Heigl Leaving Grey's?

So, is Izzy really gone? I'd say yes due to how Katherine's movie Side Effects was shilled over the last 8 weeks (or so) of Grey's. I wonder if she was cut voluntarily or if the plugs for SE were part of her g'bye compensation...

That's too bad, I'll miss the delightful Ms. Heigl, who I've had a crush on since the abysmal Under Siege 2: Dark Territory.

(Interesting note: Katherine is listed as Executive Producer of Side Effects.)