Sapphiron and Malygos both should now be working as intended.
Sapphiron's Frost aura has been hotfixed to return to levels that we've all seen previous to patch 3.0.8. This means there should be 1200 damage every 2 seconds in the 10-man version, and 1600 damage every 2 seconds in the 25-man version. Note however that the tooltip is incorrect, in that it says the damage occurs every second. According to Daelo this will be fixed in the next client patch (and no, there is no indication of when that is).
As for Malygos...
He's been hotfixed to add a small amount of time from the point when he lands after the Vortex to the point where he does his Arcane Breath. Ideally this will let hunter pets get in position. Malygos 10-man should have been working fine already, and this change should only affect 25-man Malygos.
There is no indication if the lag induced and healing-related problems of Malygos have been fixed. I'm betting they have been though.
We'll update this post if we get any more information in on this tonight.