There have been a whole slew of changes to hunters for 5.4.
Readiness is gone.
We got a new Stampede in PvE as a dps cooldown. And some shots got a buff. So our overall damage may be the same or up or down. It's still TBD.
But our defensive bonuses that could be helped with Readiness are a bit hosed. We get a lot less Deterrences even though there's a charge (our CD will be a full minute longer). We have a lower CD on Disengage which is great, but can't chain them.
There are many offensive bonuses from Readiness. Murder of Crows is getting buffed +40% damage, but you can't readiness with it. (Really the CD and focus cost should just be reduced.) Overall MoCs looks like a wash. (Some call it a nerf but it really depends on how long the fight is and how long the boss is at less than 20%.) That said, Lynx Rush is at the same talent choice level as MoCs and it didn't get any damage buff. It was already behind, so I don't see it ever being taken without some sort of change to it.
Back to back Rapid Fires need to be balanced in the add-extra-damage review. I had expected them to add to the duration and/or cut from the cooldown. But there was no change there.
There are other short-falls from removing Readiness. There are many 15 and 30 second cooldown abilities that you could hit, readiness, and recycle through immediately for burst.
Another loss is Exhilaration. It needs a buff right now, but without Readiness it can't be used twice.
Master's Call isn't reset-able. And of course one of the biggest losses for PvP is no more Bestial Wrath.
I don't miss Readiness. But I do think many of these other abilities should be adjusted with charges, longer durations, and/or shorter cooldowns.