Huh? What upgrades? And what makes you think there's many GBAS approaches? As per AIP, there's only one GBAS-equipped location (USTR), and even that one is NOTAM'd out:
GBAS U/S. GBAS GNSS APCH NOT AVBL. 02 JUN 04:00 2011 UNTIL 31 DEC 23:59 2011. CREATED: 02 JUN 04:10 2011