-Mind shackle scarabs now cause fear (Which is a shitty rule that a lot of armies are immune to)
And only in challenges, which is hilarious.
-Whip coils now give the far less impressive +3 int (Meaning you can waste points on something that doesn't even guarantee that you will go first). Mind you with their now insane str characteristic they also hit a lot harder.
But they're cheap and let you go before everything but Eldar, Slaanesh Daemons and characters. Wraiths were always strength 6 - it's the added Fleet and T5 for no additional cost (as well as a formation to give them Reanimation!) that's the real kicker that makes Wraiths amazing
-Septeminal weave and +3inv/warscthe are now gone (Mind you he later cost so much that most people didn't use it anyways)t
I'm pretty sure the Overlord can still bring a Warscythe (and going from AP1 to AP2 isn't exactly a huge nerf) and with Reanimation being a strong rule that got made even better, I don't think that's a huge issue (you've got 3+/4++/5+++ with potential for re-rolls or +1 from a Cryptek; bear in mind you activate your Res Orb after you've seen the results of your Reanimation, so you can pop it when you die for a second chance at making your saves).
-Can only snap shot when disembarking from a night scythe (So in other words its mobility is almost entirely for positioning as having constant shaken result on passengers cripples them the turn they arrive). Mind you this kind of had to be done.
Invasion Beams haven't changed - if you move 18" to 24", you don't Snap Shot when you disembark; it's only if you zoom your 36" then disembark that you get Snap Shots.
I'd add to the list that Scarabs got a lot more expensive, but lost the 'I instantly destroy all vehicles ever' effect that Entropic was before.
-Some independent characters are now far more effective
I dare say all of them except Trazyn are vastly better. Those points costs are crazy-low, and I particularly like how Szeras is relevant now (bubble Reanimation buffs are tasty tasty).
-Lots of units are cheaper or have better special rules/wargear
Lychguard price cuts in particular are frankly ludicrous.
-C'tan are once again of the most powerful none lords of war units.
Eh, I want to see them in action before I judge. They have the makings of a decent monster (T7 is pretty strong), but only 4 wounds and a 4++? For 250pts? That's a *hell* of a lot of points.
I'd add other things to the list, but there's way too many things that have been made a lot better to even begin. Reanimation alone is huge.