They didn't really split. Stas offered to step aside so she could find a better partner. He continues on as her coach.
Their last competition for Ukraine was Feb 15, 2011, and she has to sit out for a year. That's why V&T can't go to Euros this year, but can go to Worlds, assuming they meet the ISU minimum score at an international that takes place after Feb 15 (they plan to attend two such events).