Much of the Olympics will, as I mentioned in the previous post, will be broadcast in Australia on Channel 7 (Prime TV in regional areas) in high definition. Some of the overflow will be carried by SBS, as agreed between the two broadcasters.
SBS will not be changing its broadcasting equipment, or broadcasting standards, prior to the Olympic Games. Consequently SBS will be showing its part of the Olympics in 576i SDTV — its low bitrate, lousy quality version thereof. Presumably it will also be showing in 576p, deinterlaced I suppose from the 576i feed.
Note, when I check a couple of years ago, the MPEG2 bitrate of SBS HD (ie. 576p) was actually less than that of Prime SD (ie. 576i!) However, I really ought to update my figures.