No they are very specifically saying that, and have been clear about it since day one
A spokesperson for the Metropolitan Police said that ...
"Westminster Magistrates' Court issued a warrant for the arrest of Julian Assange following him failing to surrender to the court on the 29 June 2012," a statement said.
"The Metropolitan Police Service is obliged to execute that warrant should he leave the Embassy."http://www.independent.co.uk/news/uk/home-news/julian-assange-arrest-leave-ecuador-embassy-metropolitan-police-london-wikileaks-sweden-drop-a7744231.html