I was thinking about the new 'Nid codex over lunch and remember a story a friend of mine told me about fighting 'nids in a tourney situation.
My friend had to face two trygons on the board, and had a tough go of it. Got me thinking for some armies that alone could be a game decider, expecially with multiple 6W critter's running around. For instantance my IG 10+ chimera's would not have much a problem, but my Tau that have just 4 weapons >= str8 would have a tough go of it.
I wondering if you are going to see more mechanized armies in a competitive situation because of tyranids.