The City of Phoenix has just announced proposed bus route changes to be effective December 28, 2008. These changes, if approved, would go into effect one day after light rail service starts on December 27 and are designed to realign bus service to coordinate with rail service.
Some routes will be rerouted to stop at rail stations. The Red Line will go away because it is largely redundant with rail service, although the portion of it near MetroCenter will be replaced with expanded service on Route 15. The Blue Line will be replaced with a new route that goes from Camelback & Central to PV Mall, and the 0 line along Central Avenue will see schedule reductions due to light rail.
My guess is that these changes make sense for the most part, but there will be some passengers inconvenienced. For example, someone who lives in south Phoenix can now travel to the Biltmore Area or PV Mall without a transfer via the Blue Line. That will no longer be possible.
The biggest question unanswered is if bus lines that intersect with light rail stations will see any increase in frequency. If will do little good to have 10-minute interval between trains during weekdays if there is a 20-minute wait to transfer to a bus for the final leg of the journey.
See this link for details on the proposed changes, open houses, and hearings: