Computations Tx and node Compensation


I am curious as to whether or not Enigma has decided on how nodes will be compensated for computations? Will it be a set price per computation? Will it dependent on network traffic and be variable? If it has been decided upon what are some general estimates on a per computation cost? Furthermore, with the launch of mainnet coming eventually are there any ballpark estimates on the number of Tx/month/day/minute/second (or anything at all) we might expect at launch? By the end of Year 1?