Despite the instant gut reaction that LV means certain death, I think it may be an overreaction, and I feel it could result in some new swarm builds. I will try them next month against the stock 3 armies - marines, orks and guards.
Some positive feedback(ie non-nerfs): +5 cm move for the assault spawns. Finally! Throw them in with warriors and they will move faster and soak up a lot of AT fire. These are very resilient.
The reduction of gaunts to 75/3 means more points can spill over to uncommon broods, making more of them viable.
Some other remarks:
If Tyranid warriors should prove (by playtesting) to be too vulnerable, why not add the option of taking 0-3 extra tyranid warriors (instead of reverting back to INF status)?
Would 25cm move on hydraphant increase its viability? It is strictly CC, and as far as my models go, have longer legs than Hierophants

Oh, and why 100 for 3 gargoyles? They cost 25 in independent swarms, and received no boost. 75 would be more logical, or were they overpowered?
The possibility of the uncommon zoanthrope cluster seems a little bit weird. Are they meant to be spammed, or is it an error?
/fredmans