Update: As I expected, the giant Zongzi will be auctioned off at a base price of one yuan. June 19.
In constrast, another shop at Wujiaochang Commercial Street in Shanghai put an even larger Zongzi in front of its door, but it is an 5-meter-tall inflatable plasitic one (world's largest zongzi?). Apparently in such a hot weather nowadays in China, to my own viewpoint, this is a much better idea as the glutinous rice dumpling easily becomes soured.
Links: Xinhua via Spluch | Xmnext