Today CBS 2's "The News at 5:00" began using an anchor opening. Here's a list so far of which newscasts use these openings, and when:
The News This Morning: Before first commercial break each half hour (around :09 or :39)
The News at 5:00: After first commercial break (around 5:10)
The News at 6:00: After 2nd commercial break (around 6:15)
Nightcast at 11:00: After first commercial break (around 11:10)
To the best of my knowledge, "The News at Noon" does not yet use an anchor opening, but I expect them to use it before the week is over.