[Crazy Jetty]

I've never experienced them closing one store to open a bigger one. Around here they just convert Walmarts into supercenters. (There are no normal walmarts left now)

OH WAIT! They did do that one time, over ten years ago they shut down one and built a supercenter across the street.
If memory serves me, I think they did reduce and clearance *some* (not all) of the stock. (That in no way means yours will)
There will likely be aone or two weeks where the old store will close down while they're moving everything to the new one.
And believe me, you *will* know when the supercenter will open ahead of time.