If you look at WIVB-TV 4's home page, there's a small posting regarding signal strength, & transmitter updates. A recent article in the Buffalo Evening News mentioned a goal of a Nov/Dec/Jan time frame for OTA digital broadcasts for that station.
Here in Rochester, I've heard that WROC-TV 8 and WHEC-TV 10 will meet the May 1, 2002 FCC deadline (I don't know about Fox & ABC). Whether those digital signals will include pass-through of HDTV material is another issue.