actually its been decided since rivalspecies last patch, although we did not really think about it much and thus did not actually tell anyone that did not ask when we were doing.
RS2 has actually been in planning and development for some time beyond the inital announcement, there were models done for 2 aditional teams (chaos and the titans) and plans for a whole pile of stuff thats now been scrapped in favour of the synapse tyranids.
We REALLY dont want any more polls, they were just there to get some feedback and had everyone voted for 40k fishmen or squads as the race then we would have ignored most of you and gone with core 40k armies.
Well maybe, some of us miss the squats but we are using the race that ate them! *stunty tyranids, interesting...*
soem of the old dev work:
http://www.chromeangel.co.uk/rspecies/WIP_Marine.jpg - origional bob
http://www.chromeangel.co.uk/rspecies/Tyranid1.jpg - origional warrior
http://www.chromeangel.co.uk/rspecies/evil_bob.jpg - Evil Bob, now defunct
http://www.chromeangel.co.uk/rspecies/Bob_Cammo.png - camo bob
http://www.chromeangel.co.uk/rspecies/Reaver.jpg - Reaver Titan
http://www.chromeangel.co.uk/rspecies/Jimmy2.jpg - Jimmy the Gaunt
Oviously most of these have since been put into the cold hardness of Chromeangels defunct model store beside the cryogenically frozen head of Walt Disney, but they were done.
The Nid warrior and termiguant have since been reworked and there "evolution" continues, the finals will oviously be seen in game.