Ahead of each round of fixtures in the Premier League, W2W4 looks at the main storylines to keep an eye on. Arsenal and Chelsea seek to forge new identities while Mauricio Pochettino wants Tottenham focused in light of some disappointing news about their new stadium.  1. Expect the unexpected as Chelsea face Arsenal Once upon a time, you'd know what sort of game you were in for when Arsenal visited Chelsea. For the most part of the Roman Abramovich era, muscular, strong-willed Chelsea would flex Arsenal aside, apart from the few occasions when the Gunners' more subtle attempts to play through their opponents would come off. The results weren't always predictable, but the pattern...
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