The whole "pentaband" and "international" version is a bit confused. There appear to be at least three versions of the 920: one for the U.S. and Canada, one for Australia, and the supposed "international" variety. Here's what I found on Nokia's website:
U.S.:
GSM (2G): quad-band (850, 900, 1800, 1900);
WCDMA (UMTS/HSPA/3G/fake 4G): quad-band (850, 900, 1900, 2100);
LTE (4G): penta-band (700, 800, 1700, 1900, 2100).
Nokia Lumia 920 Specifications - Nokia - USA
Australia:
GSM (2G): quad-band (850, 900, 1800, 1900);
WCDMA (UMTS/HSPA/3G/fake 4G): penta-band (850, 900, 1700, 1900, 2100);
LTE (4G): 6-band (700, 800, 900, 1800, 1900, 2600).
Nokia Lumia 920 Specifications - Nokia - Australia
Global:
GSM (2G): quad-band (850, 900, 1800, 1900);
WCDMA (UMTS/HSPA/3G/fake 4G): penta-band (850, 900, 1700, 1900, 2100);
LTE (4G): 9-band (700, 800, 850, 900, 1700, 1800, 1900, 2100, 2600).
Nokia Lumia 920 Specifications - Nokia
(The corresponding pages for France, Germany, the U.K., and other countries also show the 9-band LTE that the above "global" page shows. This is what I'm calling the "international" version.)
The U.S. version has 4 bands of WCDMA vs 5 bands elsewhere.
The U.S. version has 5 bands of LTE vs 9 bands on the "international" version vs 5 in Australia (with only 3 of the 5 in common with the U.S.).
So, is this "international" version a real product that end-users will be able to buy or does it simply show the range of frequencies that additional 920 sub-types could have if so chosen by carriers from a new market? If it's a real end-user product, can someone point to actual evidence that it wil be offered for sale?