Somehow, it seems like Rogues will be displaced by the introduction of a Plate-wearing, close combat DPS class. Especially in 25/10 man raids. Possibly even 5 mans. I'm not saying they won't have their uses but... in terms of guild preferences, I foresee Death Knights being above Rogues.
Although I'm also sure the extra 10 talent points will cause all sorts of fun things to happen. I just wish they'd bring out some information about the new skills for other classes.
I sincerely hope the balance of the game shifts away from the "bigger is better" idea, and more towards finesse. Though I suppose if they're going to give a 10 level buffer every year, the numbers are going to become bigger whether I like it or not...
Plus, the current max level is limited at 255... though I suppose if the game lasted 20 years, Blizzard would probably consider that a perfectly respectable run. Actually, I think any MMO would.