I am not sure if this was an unintentional ommission or not.
In the previous versoin of the play test guide, the Eidolon gained 2 evolution points at every level where it did not gain HD/BAB/Skills points.
In the updated version you altered the HD advancement but not the evolution points gained table. I think this is a mistake, as the old pattern made it feel like the eidolon was still getting better on the dead levels.
This would net the eidolon +1 evolution point at levels 8, 12, 16, and 20. I feel that is it smooths the power growth over levels a bit. If you are concerned about power creep I'd drop the entire table by 1 point (start at 2) but maintain the progression of getting the 2 point increase at levels where the HD does not increase.