He was probably just transferred to a new body. I say that only partially in jest.

In an odd way, there's a small part of me that hopes this isn't true. Soros is likely the highest ranking member of the Cabal that's publicly visible. While his financial worth is far greater than what the news reports (His real wealth is close to 1 trillion usd), I sincerely doubt that he was much more than a lieutenant in their little army simply because he was a publicly known figure.

And because he was publicly known, he was a useful indicator as to the tactics the Cabal was engaging in. The waters get a little murkier with him gone.