I was trying to rework our personal spreadsheet based on the new course. The spectator tool from last year's HALF will work for the first 8 miles of the full this year as it is the same course.
One needs to figure out what is important for you and the spectators. If MK is important, then AK is almost a no-go. Or it has been. The added mile for the race track makes the AK a possibility this year for runners slower than a 12-14 minute pace.
I am almost certain the rD will not recommend trying to catch a runner in both places. However, if one does catch the runner at TTC then bails to AK by taking monorail, first resort bus leaving from Epcot then AK bus, they may make it. I needed Mary to catch me on the old course and she was able to go to OKW that year and pick up something I needed and catch me at AK. It was tight, so tight that she later admitted walking up to the line as I passed.
Getting back to this year, we run 10 miles between TTC and the AK bus stop. For a 10 minute runner, that would mean the spectator would need to get to the AK within 1:40... maybe possible. Timing with the regular busing is where this may fall down this year. That same 10 minute runner would pass the TTC around 6:20-6:40. That means they would be passing the AK bus stop just after 8 AM. On race day, AK opens at 9AM. This pushes the early limit of the bus schedule so that 10 minute runner's spectators would possibly not make it in time. However, a 14 minute runner would arrive at the bus stop in the 9:10-9:20 range... making the TTC/AK split a possible opportunity this year.
The issue with heading to AK to watch is that bus times back out from the park can be tremendous. Runners have the left lane on Osceola up through Buena Vista (All Star Exit). All traffic must leave here and traffic can back up for a good half mile or longer since all traffic is forced to turn left at the intersection below.
The WWoS is served by bus for spectators this year, at least according to runDisney. I think that would be an interesting trip... though, I am uncertain how the mouse will effect the bus stop there. It looks like they are touting the baseball stadium as a spectator point, but I am betting that is not a great opportunity as one must cross the course to get there. It will be interesting.