I keep an eye out for upcoming changes, and there quite a few interesting one.
Resilience scaling has been modified for linear returns, as opposed to increasing returns. Under the new formula, going from 30 resilience to 40 resilience gives players the same increase to survivability as going from 0 to 10. Resilience now scales in the same way armor and magic resistances do. A player with 32.5% damage reduction from resilience in 4.0.6 should see their damage reduction unchanged in 4.1. Those with less than 32.5% will gain slightly. Those with more will lose some damage reduction, increasingly so as their resilience climbs.
All non-damaging interrupts off the global cooldown will now always hit the target. This includes Pummel, Kick, Mind Freeze, Rebuke, Skull Bash, Counterspell, Wind Shear, Solar Beam, Silencing Shot, and related player pet abilities.
Several persistent ground effects now display different visuals for hostile and friendly players. The following spells have the same visual effects for friendly players, but new alternate visuals for hostile players: Ring of Frost, Consecration, Desecration, Wild Mushroom, Flare, Ice Trap, Power Word: Barrier, Smoke Bomb, and Hand of Gul'dan. As a general rule, the alternate effects have a red tint or hue indicating they are created by an enemy player.