AEC mining will start in about 1 month from now that question is impossible to answer.
Litecoin is very likely to be a popular target for FPGA`s so the daily LTC gain is very likely to decrease for users mining with GPU`s considering that when/if the difficulty rises your gain decreases but your electricity cost remain the same.

We belive that the strong points of AEC will be that it will only possible to mine with a GPU and the exchange will make Crypto>FIAT conversion fast and simple.