UPDATE 3: Timbers coach John Spencer was on ExtraTime Radio and talked about the preseason tournament. The only question at this point, is when it's taking place. Of course, this tweet should give you a clue:
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UPDATE OF MY UPDATE: Steve Goff just responded to my email (Yes, I was shocked too) and said the reporting was accurate as it had been confirmed by multiple league sources, but noted that this "rivalry week" was being discussed for 2012 at the earliest, not for 2011.
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UPDATE: It's looking more and more like there may have been some misspeaking/misunderstanding when news of a Cascadia Cup rivalry week came out. Marc Weber of The Province reports that Vancouver Whitecaps president Bob Lenarduzzi downplayed the possibility of a rivalry week, but added another voice confirming talks of a preseason tournament.
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I've been unable to confirm a Washington Post report that says MLS is planning to cram three Cascadia Cup games into a single week, but I have learned that plans are close to being finalized for a three-day, round-robin preseason tournament at Starfire Sports Complex that would essentially work as a Cascadia Cup preview. The Seattle Sounders, Portland Timbers and Vancouver Whitecaps would all play one another during the event that would also potentially feature academy teams.
Details are still being finalized and should be announced in the next couple of weeks, but I've received multiple confirmations that this is likely to happen. Among those details are how to keep the various supporter groups separated. Portland and Seattle played a preseason game last year without incident, but that was at Qwest as opposed to 2,000-seat Starfire.
Whether or not this is at all related to the Washington Post report is unknown, as I've been told that is something that would be decided at the league level. In Steve Goff's story, he said the plan was for the Sounders, Timbers and Whitecaps to play each other over the course of about a week, presumably with each team hosting one game and going on the road for another.