From GamesIndustry.biz:
...a Sony Computer Entertainment UK spokesperson today outright denied that any such message [concerning used game sales] had been conveyed to retailers - telling GamesIndustry.biz that following conversations with the firm's European parent company, neither division has "any knowledge" of such a strategy.
"We have definitely not been communicating that," UK spokesperson Jennie Kong confirmed. "It's false speculation. We don't have any further knowledge about this topic - either officially or unofficially, to be frank."
That's definitely a denial, although I always look for gaps in what people are saying, and the phrase "we don't have any further knowledge about this topic" seems unnecessarily vague. Regardless, it would be suicide for Sony to try this, no matter what the used game market costs them.
It's also nice to know that someone from Sony can make a statement without jamming their foot up our ass.