Thanks for Bruce Moomaw for these two links:
There would be a single lander that would touch down on the flanks of a volcano, Mielikki Mons, which an infrared spectrometer on the Venus Express spacecraft has identified as a possible location of fresh lava flow.
The craft would make measurements during the descent with "temperature, pressure, dynamics and wind speed hardware, a tunable laser spectrometer to measure stable isotope ratios and a neutral mass spectrometer to measure gases." Cameras would take descent and landed images. A robotic arm would scrape aside the top layers of soil while a "a neutron-activated gamma ray spectrometer and a third spectrometer [presumably a laser-induced breakdown spectrometer ("LIBS")] would measure soil chemistry.
See http://futureplanets.blogspot.com/search?q=raman for more on the possible surface composition instruments.