It's interesting what you say about WIBW, and the recent 16:9 ratio on their local material.
Here is why I assumed that they were beginning to up-convert the 1080i/4:3 to 1080i/16:9:
I use a Sony HD300 to receive my locals, including WIBW 13.1, (44), OTA. It feeds my plasma via Auto-DVI and hence will only output 480p and 1080i as my Panny plasma does not accept 720p.
Now, when the Panny receives a 480p broadcast, I'm able to use multiple 're-sizing' modes, BUT when it receives a 1080i broadcast, it only allows Shrink, Standard and Expand. I have only been able to use the later, (1080i), modes when viewing WIBW regardless of whether they were broadcasting the local programming in 4:3 or the recent 16:9. Therefore, I was thinking that they are simply broadcasting SD local in 1080i, BUT had begun to convert that broadcast from 4:3 to 16:9.
It would be great if someone from the station engineering dept. would actually let us know what 'resolution' and format the local programming is being sent out in. It certainly looks very good considering it is not captured in HD; (except for the video artifacts and A/V sync issues of course).