Universal brought in Blue Man Group as competition for Cirque du Solei. It's a seperate ticket and the Sharp Aquos Theater is part of CityWalk, not the Studios themselves.
The closing "competition" for the American Idol Experience is Rising Star, a new kareoke bar that opened in CityWalk a couple of months ago. Rather than singing with a track, the people selected to perform sing with a live band and backup singers. Plus, since it's a kareoke BAR, there is drinking and it has a different atmosphere and audience than AI will have. However, since you go without entering a park it's not really direct competition.
Rip, Ride, Rockit, the new coaster going into the Studios, is a new mainline draw for the Studios themselves, and will probably be more competition for Seaworld's new Manta coaster than anything at DHS. Granted, RRR is (most likely) going to make RnRC look like a mouse-coaster when comparing "music coaster" to "music coaster."
The Wizarding World of Harry Potter (not "Potterland"
), IS going into IoA rather than the Studios. However, much like Everest was the main draw for all of WDW Resort, WWHP is going to be a huge draw for Universal as a whole, not just the Studios. Yes, Dueling Dragons and the Flying Unicorn are just getting rethemed (Triwizard Cup and Hagrid's Hipogryph.... but the Kuka Robocoaster attraction (you know... the one Disney wanted by now can't get for ten years) is being built and will probably rival the Adventures of Spiderman attraction in terms of shear awesomeness. Throw-in a (rumored) fully-explorable Hoggwarts castle, and you have something that WILL get people's attention.
Frankly... Disney had better thinking about Universal right now. Starting the end of this year, the theme park competition is going to start getting down-right insane.