Well maybe by 2011 MS will have their head outta their hind-end and work on something that isn't totally bloated and deplorable... But in the meantime, the article states:
"To help Windows XP cope, advanced format drives will be able to pretend they still use sectors 512 bytes in size.
When reading data from a drive this emulation will go unnoticed. However, said Mr Burks, in some situations writing data could hit performance.
In some cases the drive will take two steps to write data rather than one and introduce a delay of about 5 milliseconds."
It will still function under XP. Your existing drives will also still function. You have a year to stock up on existing terabyte drives with 512k sectors before this will ever affect you.