Jetstar A320 wingtips

[Tim B]

While waiting for a Qantas 767 flight from Tullamarine to Sydney on the weekend, I was doing a bit of plane spotting and noticed something different about Jetstar's A320's. Three A320's had upswept wingtips similar to those seen on Boeing 737's. Does anyone know if these planes are new to the Jetstar fleet, are they an A320 upgrade or retrofit? The planes spotted with these wingtips are VH-VFT, VH-VFU and VH-VFP.