Telstra, the premier Windows phone carrier in Australia, has started pushing out the Tango update to the majority of their Windows Phones.
The updates have been approved for the Nokia Lumia 800, HTC HD7, HTC Mozart and the Samsung Omnia W and some users are reporting receiving update notifications.
Unfortunately the LG c900K is still in testing, but is still scheduled for this month.
The update should bring improved MMS, bring some bug fixes and also internet sharing via WIFI to some phones.
Thanks Dawookie for the tip.