Ok, there has been a lot of confusion and misinformation around. Some scream thanking heavens, some drown in tears of QQ. Thus, I'm approaching the CS and Seals changes with 3.2 from a purely PvE point of view, and with a purely mathematical approach.
I'm assuming for this model the stats of my guild's number 1 retpala, in a fully raidbuffed situation. This account, in specific for what concerns this comparison, into having all buffs that boost melee damage, the spellpower buffs from ToW and Fish Feast, and Ebon Plaguebringer. This is a very common situations for 25men raids.
The resulting stats of our interest are: 6632 Attack Power, 2315 Spell Power, an average white swing hit for 2652 damage, and a swing speed of 2.71 seconds (RAWR most recent model). To simplify the math, I am not accounting for crit (for now).
Let's see first, what Crusader Strike does. With 3.1, now, CS is a base of 110% weapon damage, modified by 15% form Sanctity of Battle and 10% from Art of War. Vengeance and 2handed weapon spec are already accounted in the base weapon damage. So we have a (they are additive, afaik) 135% weapon damage, on a 6sec cooldown.
So we have CS = WP*1.35 = 2652*1.35 = 3580 damage
Hence, CS(dps) = 3580/6 = 597dps
With 3.2, we have a base of 75% weapon damage, for a total, after talents, of 100% weapon damage, this time on a 4sec cooldown.
So CS = WP = 2652 damage
CS(dps) = 2652/4 = 663dps
A net increase, with these stats, of 66dps, roughly 11% more.
Let's look at the Seals now, which is the most tricky part. First, let's look at Seal of Blood now. It hits for 48% weapon damage on every swing.
SoB = WP*0.48 = 2652*0.48 = 1273 damage
It gets modified by Ebon Plaguebringer, and I'm assuming from Vengeance, Crusade and Sanctifed Retribution. It results, additively, on a 28% damage buff.
Hence, SoB = 1273*1.28 = 1629 damage
DPS from white swings = 1629/2.71 = 601dps
DPS from CS = 1629/6 = 272dps
DPS from DS = 1629/10 = 163dps
DPS form Judgement (assuming it procs off that too, which I think it does) = 1629/8 = 204dps
Mind you, this is an ideal situation when every ability goes off perfectly every cooldown. The reality teaches us it is much lower, but for the sake of comparing values it will do. We have a total of 1240dps from the Seal, assuming only regular hits.
Now let's look at Seal of Vengeance. It does 15% of AP plus 8.8% SP as holy damage over 15 seconds, stacking up to 5 times.
With the mentioned values, we have:
SoV(single) = AP*0.15+SP*0.88 = 1198damage
SoV(stacked) = 1198*5 = 5990damage
To this, we'll add Vengeance, Crusade, Sanctified Retribution, Ebon Plaguebringer and of course, Seals of the Pure (I don't think anyone would be insane enough to skip the talents and use SoV :P). Additively, these account for a 43% damage buff.
Hence, SoV(stacked) = 5990*1.43 = 8566 damage
To this, we must add 33% of weapon damage every swing once the dot is fully stacked. I'm hereby assuming that the Seal procs off CS and DS aswell (the dot does), but (since now the dot doesn't I think) not off its own judgement, unlike Blood. Follows:
SoV(swing) = WP*0.33 = 2652*0.33 = 875 damage
Assuming the same buffs, it becomes SoV(swing) = 875*1.43 = 1251 damage
DPS from white swings = 1251/2.71 = 462dps
DPS from CS = 1251/4 = 313dps (remember, CS is at 4sec with 3.2)
DPS from DS = 1251/10 = 125dps
Now add DPS from DoT effect = 8566/15 = 571dps
The total DPS awarded by Seal of Vengeance is 1470dps. Again, assuming only regular hits and again with an ideal situation. The net gain over Seal of Blood is 230dps, roughly a 18%. As you can see, this is already a substantial increase.
Let's look at the judgements now. Seal of Blood's judgement does 26% weapon damage plus 11% of AP plus 18% of SP as holy damage.
SoB(judgement) = WP*0.26+AP*0.11+SP*0.18 = 1836 damage
And it gets buffed by Ebon Plaguebringer, Crusade, Vengeance, Sanctified Retribution, for a total of 28% extra damage.
SoB(judgement) = 1836*1.28 = 2350 damage
Hence, DPS = 2350/8 = 294dps
Seal of Vengeance's judgement does 14% of AP plus 22% of SP as holy damage.
SoV(judgement) = AP*0.14+SP*0.22+1 = 6632*0.14+2315*0.22+1 = 1438 damage
We also know SoV judgement gets buffed by 10% every stack, for a maximum of 50% at 5 stacks, so we have:
SoV(judgement) = 1438*1.5 = 2157 damage
Adding in Ebon Plaguebringer, Crusade, Vengeance, Sanctified Retribution and Seals of the Pure we have:
SoV(judgement) = 2157*1.43 = 3084 damage
Hence, 3084/8 = 386dps
Yes, Vengeance's judgement hits harder than Blood's. The net gain is 92dps, roughly a 30%.
What are the results from these two changes in the end?
With 3.1 we have a total of 2131dps, from CS at 135% on 6sec, Seal of Blood and Judgement of Blood.
With 3.2 we have a total of 2519dps, from CS at 100% on 4sec, Seal of Vengeance and Judgement of Vengeance.
The net difference is 388dps, meaning 3.2 changes for Seals and CS are roughly a 18% increase in sustained DPS.
I don't pretend that this model is perfect, but it is based on some decent math and common sense assumptions / known formulas. While we all know that 3.2 is still in early design and many things could change, this is a reasonable comparison of what we can expect as things were stated in these patch notes. I hope this helps clearing some doubts.
Edited: I damm know I'm missing some buffs. For the sake of knowledge, please correct me if you spot errors or things I've forgotten.