Alright, so after dragging out my general-purpose 1500 point list and re-writing it with the new codex, I ended up with the following:
-Gained 11 Termagants
-Lost Mycetic Spore for Dakkafex
-Lost Crushagon (Tervigon + Iron Arm + Crushing Claws . . . good times)
-25 points left to spend
Now, I'm not pretending my list was incredible, and I would definitely modify it if I was going to play the new book; however, I really don't like where I sit now. Whereas before, I could roll up Iron Arm on my Tervigon and she'd singlehandedly take any objective away from anything short of a squad of TH/SS termies, now she feels more like a liability than an asset. I would need to drop or re-think my Genestealers (maybe run them as a couple of fivers just to try to nab objectives?). I understand not everything is going to be good, but they're kinda what drew me to 'nids in the first place, so I'm disappointed that they're junk. I don't like not having the pod-a-fex option to disrupt my opponent, and I could stick a Trygon in there to do the same thing, but not as well. The Prime is also junk as far as I can see, which is again disappointing as I had one converted from a 2ed Hive Tyrant.
In summation, I'm looking at quality decreases, points increases (Hive Guard, Tyranid Prime, and since Tervigons don't share buffs anymore, my Termagants are 8 points a model with toxin sacs and adrenal glands vs. 6 in the old book, and replacements don't even get those buffs), and lost utility. This book is a clear loss for me.