Professor Vince Gaffney, when talking about the pits, said that they investigated the cursus and found "two very large pits, one in the east end and one in the west end of the cursus." He reiterates "these pits were inside the cursus." Furthermore, if you stand at the Heelstone on Midsummers Day, then the sun rises over the eastern pit and sets over the western pit.
I am wondering, have you taken your information from the aerial view accompanying your news link? The "New Discovery" on that image must be the "new mini-henge" which this team claimed to have discovered some time ago.
Here's Vince Gaffney's podcast:
http://www.birmingham.ac.uk/Audio/news/Vince-Gaffney-podflash.mp3
http://www.heritagedaily.com/2011/11/discoveries-provide-evidence-of-a-celestial-procession-at-stonehenge/ .
Prior to seeing that I expressed misgivings from the text , it now looks like the Heritage Daily spot is not correct , hardly my fault . However the problems remain with the detail ,when the mid point between the two solstices is halved it does not lead to a point that when produced due south leads to the centre of Stonehenge ,it actually tead to a point 180 metres to the east the cente of the prominent bell barrow .