I really hope Toyota will be competitive straight out of the box, as it will be nice to see another manufacturer apart from Peugeot and Audi running up front at Le Mans.
I have the feeling that it will take a year or two for Toyota to find its feet though - look at how well Aston Martin's return to LMP1 went this year: both cars out at Le Mans within 10 laps and the company reverting to its older, enclosed cockpit design for the ALMS series.
I pray that their lackluster F1 results aren't repeated... [-o<
More interesting will be 2014, when new Le Mans rules come into play. Nissan has confirmed that it is interested in putting a factory car into LMP1 and there are rumors that Mazda and Honda are interested in re/entering the category with factory cars as well.