Your 24-70 will serve fine for a lot of your purposes, though frankly I like mine better as a portrait lens on a crop camera than on full frame. The image qualty of the 24-70 rivals any of the primes you're considering. The only benefit would be larger apertures (about one stop larger... the 50mm gets a bit soft larger than f2 or f2.2. The 35mm maxes out at f2). Another benefit would be the smaller size of the prime lenses, compared to the 24-70. Early reports are that the 6D is at least as good as the 5DIII's high ISO performance, so you should see a minimum of one stop higher usable ISO than you enjoy now with your 500D.
But, mainly, with so few lenses in your kit, you probably would be best served by not duplicating any of the focal lengths you have (i.e. skip over both 35 and 50mm primes for now). I doubt this will be your last gear purchase. You can always add more lenses later, if you find something lacking.
No prime lens is as "flexible" or versatile as a zoom. The reason for going with primes instead of zooms are: smaller size, less intrusive, potentially larger apertures, possibly better image qualities in some ways. Problem is you are putting mostly mid-grade primes up against one of the best zooms on the market.
For people and portraits with a full frame camera, the choices are easy: 85/1.8 and 135/2. Or, as a single lens alternative: 100/2 or the 135/2.
Personally I do not like using macro lenses for portraiture. Too sharp and "clinical" looking. Also, macros are limited to f2.8 at largest. Plus most are slower focusing, which may not matter with posed portraits but can make a difference with candids.
Personally I'd also want a wider lens for your other interests.... landscapes and such. If budget is a concern, either use your Tokina or go with one portrait lens and get a 20/2.8 for a wider lens. FYI, your Tokina 12-24 can be used on full frame as wide as 18 or 19mm before it starts to vignette. However, a 20/2.8 is better corrected and will give less distortion.
I use both crop and full frame. Often when I'm only shooting with the FF camera, especially when travelling with it, I carry this minimal lens kit:
20/2.8
24-70/2.8
135/2
300/4 IS
1.4X teleconverter (usable on either 135 or 300mm)
My interests also include wildlife, hence the longer lens and teleconverter. For macro, I always carry a set of extension tubes, which in this case work very well with the 24-70, 135 and the 300/4. The 24-70 and 300/4 are already very close focusing even without any extension.
