Correct me if I’m wrong, but weren’t Heroics supposed to get a 4* rate boost with this update? Can’t remember exactly where I heard it, but maybe the last video update?
Or is it just because anniversary week hasn’t started yet? Maybe I’m crazy, or just crazy hopeful.
They did get a boost. 1/10th of 1% extra chance per draw for 4*s. Enjoy that! 
They did get boosted. By about 50% relative to what they were. But these changes are just barely keeping up with the 4* introduction rate. They are mostly just keeping the chance of pulling any given 4* at about .5%, even as the total number of 4*s increases.
Just what you wanted to hear right?
You sure? Pretty sure they were already 0.3% each. Or is it just that there’s more of them now? Which would be…a disappointing way to increase the odds.
Yeah, the odds pool is more “4s = X%, 3=Y%, 2*=Z%” and they just divide that pool by the # of characters in that tier.
I remember back before the current 4* flood, and during the last 3* flood, when the only 4s were Wolverine, Invisible Woman, and Nick Fury, that the odds of pulling a XForce Wolverine were actually greater then the odds of pulling a Hood, or any other specific 3.
wants a 99.9% draw rate 
Anniversary hasn’t started yet, even if you have the R85 update early (ios users).
The last update to rates was with 4* going from 0.2% to 0.3%, which in addition to adding new 4*, is in fact an increase.
If there is to be another one (which even just introducing Creepsicle to the packs will do), it might be a daily push once the anniversary stuff goes live.
Adding Iceman to the Heroics won’t increase the odds of getting a 4*. It’ll just make it slightly harder to get one specific 4*, as they all draw from the same rough % pool.
As mentioned: It used to be easier to draw X-force Wolverine then Wolverine (Patch) because there were so few 4s and so many 3s, and they drew from the same 
Rarity pool.