Don't get too excited yet. No one knows what exactly Riot is going to do to these champions and remakes tend to be very off the wall.
------
Anyway, let's talk about something controversial. Cooldown reduction.
If you think about it, theoretically, cooldown reduction is an awesome stat on everybody, especially if you have very long cooldowns right? I propose that this is not actually the case, and that champions with shorter cooldowns actually benefit more from CDR than champions with longer cooldowns. I also think that even if building CDR is very natural to a certain champion (like Lux), you might want to reconsider and go straight up damage instead. In layman's terms, I think in the lategame when everyone has oodles of mana, blue buff is more useful on Morde than it is on Morgana.
Now, before I explain why, I'll put it out that this is my personal opinion, so it's not gospel truth. You're free to think otherwise, but hear me out.
How long is the average fight?Let's think about the reasoning for CDR. It's pretty obvious isn't it? You want to use your skills more in a fight. Now, let's think about this. Generally speaking, a teamfight, skirmish, or any other conflict in LoL other than a standoff lasts about 10 seconds. If you have a lot of burst, it can be even faster. A fight that lasts longer than this is really rare and would probably only happen if there was an absurd amount of tankiness at play. After these 10 seconds it's all cleanup.
If you think this number is too short, think about the length of channeled spells in LoL. Nunu's ult has to be channeled for 3 seconds. Now, imagine a fight that lasted longer than 10 seconds. It would be as if Nunu channeled more than 3 ultimates. Doesn't that seem ridiculously long for a teamfight? You can imagine most fights are over waaaaay before even the second Nunu ultimate would have finished channeling.
So we'll go with 10 seconds since it's a conservative estimate. =D
Anyway, with 10 seconds in mind, let's look at the benefits of 40% CDR on two different champions: Lux and Vlad. Lux has ridiculously long cooldowns whereas Vlad spams everything till kingdom come. Both of them also do about the same amount of damage on each of their skills.
Lux:Without CDR, all of Lux's skills are on 11 second cooldowns. Her ult on a 40 second cooldown. In the 10 second timeframe, she can use everything once. Then she's either dead, running away, or chasing someone down. With 40% CDR, everything is on a 7 second cooldown and her ult is on a 24 second cooldown. Now she can use everything twice, except her ult. So she basically gets 3 extra skills.
Result: 3 extra skills
Vlad:Without CDR, Vlad's skills are on a 4 second and 14 second cooldown. His ultimate is obviously too long to be spammed twice so let's ignore that. This means in 10 seconds he can Q and E three times and pool once. With 40% CDR, his CDs are now 2.4 seconds and 8.4 seconds. Now he can Q and E 5 times and pool twice. So he gets 5 more skills in.
Result: 5 extra skills
Conclusion:As you can see, in actual practice, Vlad got a lot more use out of CDR than Lux did in a 10 second fight. This would be the same for champions like Morgana, Veigar, Heimerdinger, etc. And this was with our very conservative teamfight length. This was a teamfight that lasted longer than three full Nunu ultimates. How often exactly would you see such a long fight? If anything most fights are decided within the time it takes for one Nunu ultimate to complete. It's why I propose that if your team is going to be doing a lot of teamfighting, you're far better off maxing out your damage compared to trying to get 40% CDR. Because you'd really never be able to use your skills more than once when it really matters most.
Now, this doesn't mean CDR is useless. Far from it. CDR's main uses are for laning and poking the enemy. Having 40% CDR makes harassing an enemy away from their tower so much easier. It allows healers to heal much better between fights. Etc. If you're going to be doing a lot of poking, then getting lots of CDR is the way to go.
But now let's look at an enemy team that just adores forcing teamfights. Say the enemy has an Ashe and an Alistar and an Amumu. How would having 40% CDR help you in that case? You can't poke when the enemy can initiate at will. Now you're at a severe disadvantage. All that CDR wasted because you're only going to be able to use your skills once anyway. In such a situation, you're going to want to go straight AP.
For better or worse, most LoL games are like the second example. Everything is decided by teamfighting. Poking is almost nonexistent unless you explicitly geared your team to poke and avoid actual conflict. This is why I propose ignoring CDR on long cooldown champions. If you're going to only be doing one combo per fight, better make it worth it.
TL;DR: If getting 40% CDR still leaves your cooldowns longer than 5 seconds, you're better off just stacking damage instead unless you're planning on poking the enemy and avoiding teamfights.