As I predicted as well, Zynga responds: "It clearly demonstrates a lack of understanding of copyright laws"

http://thenextweb.com/insider/2012/08/03/zyngas-reaction-to-ea-lawsuit-is-both-unfortunate-and-ironic/

So it will be a long legal battle about the similarities that can confuse the "uninitiated observer". I do hope EA can stop Zynga's practise of abusing this copyright thing on such a scale.
If I were the Tiny Towers developer, I would watch this battle closely, there might be some claim to damages on their part as well.
 

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This one's a bit weak, though. They're only going after Zynga now because the lawyers are all tied up with the SEC investigations. It's a shark smelling blood in the water.

Besides. If they don't go after Zynga now, with the financial woes they're in, there might not be anything left to pay out.
 

(Clarification: With the financial woes Zynga is in, Zynga won't have anything left to pay EA if EA doesn't sue now.)
 

Hah, I knew EA had a legal group years ago when I asked if I could make a fan-based flash series (cartoon) based on UO.

The lady there gave me a polite "no" after talking to their lawyers because they couldn't control the content, which is fair enough.