it updated the repositories for me, but the prob is there is NO wine-64 package for Ubuntu/debian 64...it seems you have to build it yourself using:
$sudo apt-get build-dep wine
$sudo apt-get --build source wine
This however presents it's own problem in the form of the mesa-common-dev package- there isn't one for 64 bit, and it's a dependency for wine!
It is this which has prevented a port of wine to 64 bit for debian...