Gwen Stefani - Its rumored her new single might be called "Wind It Up" but then again, thats Wikipedia...
Pink - Maybe after she flopped she doesn't wanna come out again, or maybe she's thinking of what to make the next US single
Lindsay Lohan - ProActiv commercial
Ryan Cabrera - To tell you the truth, no idea...
Ashlee Simpson - She'll probably release something else, but...it's already been 3 singles...
Weezer - There's a somewhat high chance that they broke up, but its still kind of a rumor
Gorillaz - They basically are a 1 hit wonder, so even if they release something new, it won't get that big
Avril Lavigne - Rumored to come back in 2007