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It's always a bit of a guessing game to figure out what changes Google will make to their search engine algorithms. Google is becoming better and better at semantic understanding, so it recognizes keyword stuffing and low quality, spammy content. While I expect there will be further refinement of how Google weighs a link's "trust" level, it will probably be hard to pin down the exact changes. I honestly think that while Google may make SEO a bigger challenge in a sense, in that it is increasingly difficult to game the system, it is improving the content for top search results, so that site with a steady stream of fresh, original and relevant content are rewarded for it.