I want to say yes, if they use the same Half route as they did this year I would say 4 uphills: (Looking at the map it looks like they are, so I will put mile markers in)
1. Around mile 4.5 - the up hill after the down hill going under the water.
2. Around mile 10.4is the up ramp (which is going almost in a full circle) and over the over pass heading to EPCOT.
3. Near mile 11 is another over pass.
4. you make a shart turn to the right, more that 90 degrees and then head towards your last over pass (Mile 12ish) into the EPCOT parking lot.
I looked back at my garmin and this was as close to the mile mark as I could figure.
I do think the last "hill" overpass is the toughest, not sure why? makebe because it is a bit steeper than the others? You come at it from a bit of an angle and directly at it, so you see it differently?? Not sure - or maybe just because it is the last one. Who knows.
There is a bit of a slight, and I mean slight, incline when you enter EPCOT from backstage behind the living seas area, not really much of anything, but when you have done that many miles you tend to feel anything at that point.
-Tracy