currently i believe it to be the LP 560-4 spyder... there are roumours of a 4 door sedan style car but its not produced...
ya your right, they were looking at possibly producing a 4-door sedan called the Estoque but they scratched it. The newest model now is either the Murcielago LP670-4 SV or the Reventon Roadster that was just reveiled at the Frankfurt Autoshow.....if its going to be produced. Lamborghini is also in development of a new car to replace the Murcielgo. Its nicknamed the Jota and it rumored to be released for the 2012 model year.