Arthur Davrill on Series 7

SFX interviewed Arthur Davrill before the press screening of Let's Kill Hitler (which JOV97 of The Whoniverse Blog will be attending by the way).

From SFX:

When we asked him bluntly, “Will you back in series seven?” Darvill replied, “I will be coming back at some point… There is an involvement in some way.”

This indicates that the Ponds (or perhaps just Rory) will not stay on board the TARDIS for Series 7, but instead make an appearance in one or more episodes.