Thats whats known in the industry (retail, and associated services) as a "soft opening." A chance to shake out the bugs before all hell breaks loose on Grand Opening day.
And yes on the TJ Maxx thing, although it took forever to nail that down. First it was Kohl's, then Kroger was going to switch sides at the mall, then it was going to be carved into 4 retail spaces (this one was exactly one week before the TJ Maxx rumor, and both were from the management at Tanglewood), and finally - the real answer of TJ Maxx.
Yet still unrented space abounds inside, and lets not forget the massive building that is "The Sleep Zone" tucked way back there.. dead empty.