I'm not quite sure what you are asking. AFAIK, the Approach Course has been done for quite some time with no further changes or additions planned.
But the big project, taking the current 27 hole Tilly/Diddel layout back to an early 20s 18 hole course like back in the glory days, is "on hold".
And I'm sure Tom Doak will step in to correct me if I'm wrong. :-)