There has been some confusion surrounding Bluetooth 4.0 Low Energy (LE) and high-end Lumia Windows Phones. Nokia Australia recently stated that the hardware won't support the upgrade. Shortly thereafter, Nokia PR in Germany confirmed that all Lumia Windows Phones will indeed support Bluetooth 4.0 LE.
Now, Nokia Australia has backtracked on what was previously said, reaffirming what we originally believed to be the case - high-end Nokia Windows Phones will support Bluetooth 4.0 through a system update.
There you have it, folks. The Lumia 820, 920, 925 and 1020 will all support Bluetooth 4.0 LE with the next major maintenance update, which is due out by the end of this year. Currently, the Lumia 520, 620, 625 and 720 reportedly support Bluetooth 4.0 LE, but those with more premium handsets will be able to take advantage of the energy saved in the near future.
Source: Nokia Australia (Twitter)