There is still no definitive idea for who is The Undertaker's attacker. The plan as of now is Kane and one idea being pitched is having the two face off at Night of Champions and then again at Hell In A Cell.
For those who missed it, there was a reference to former WWE Superstar, Daniel Bryan (Bryan Danielson) last night on NXT. During a match, Cole said that Miz has been so inspirational to his rookies so far. Josh Mathews asked Cole if he remembered last season to which Cole said "Yeah, Miz's rookie was in first place before he voted himself off." It's also interesting to note that the WWE Corporate webpage has not yet posted Daniel Bryan's release although Carlito's release was announced on the page the day he was cut.
Speaking of Miz, he has endorsed the work of Bryan Danielson as well. Miz said recently that he's a tremendous wrestler and that he must have something working for him if people are chanting his name at WWE shows.
The WWE will announced on SmackDown that The Big Show will face The Straight Edge Society at Summerslam. Remember that CM Punk recently had two surgeries recently, so that his time in the match may be limited.