They must be going back to the drawing board to rethink the show formats. Traditionally for them, the noon news was predominately a hard news show and when they expanded it to an hour, they had the lighter stuff towards the back end of the second half hour. When the 4PM launched, it was faster paced with the news and features were dispersed through out. The 5PM has always been longer form hard news.
With Alicia possibly joining the noon (perhaps only for the 2nd half hour) maybe they want the noon show to become like (or replace) the 4PM and have the 4PM become a harder news show to compete with 10 at 4. As of right now, 10's the only station in that timeslot doing a full hard news hour. 3's doing a complete fluff show (hell they sit on damn couch) and 6 is trying to do both and perhaps they want to get away from that.