no chance - yesterday, i tried MP with a friend. we tested the old ports of EECH, didn't worked. it works, if u take your IP into the DMZ, otherwise we found no way.
btw, on
http://www.eech2.com u find the IP of the G2 games dedicated server. around 6 online skirmishes and 3 campaigns are available.
if you play with a direct connection (so one of you is the host), TURN DOWN THE SETTINGS - otherwise, as soon as you enter a area with trees around, u play with 5fps or less LOL.
besides that, the MP part seems to work. we both didn't found a possibility to set some settings, so standard is 4 players max...