The new nvidia and amd cards will be based on 28nm manufacturing process.
They are twice as dense as current chips.
This added density gives advantages that will appear in several forms.
1) Reduced power consumption.
2) More spaced used for processing threads.
3) Lower cost because of more chips per wafer.
Those factors will come in some form iof balance.
The top cards will be higher performing, less power hungry, and will sell at what the traffic will bear, at least initially.