In Rustington today (Sat) one of the empty shops is filled with 'consultation' about this. Artists impressions, plans, etc., and some Sainsbury suits standing around to answer questions.
They plan to occupy the old Focus DIY place as a temporary store while they build the new one.
The new one looks huge, covering the footprint of the current store plus half the existing car park, in the new rebuilt store the cars will be underneath.