Quote from Gamespot interview:
"When contacted by GameSpot UK, an EA representative said, "We don't think [Rock Band] will be released in Q4." GameSpot will bring you further details as soon as they are available."
Well at least were not entirely alone, in another interview with Charles Huang (Co-founder of Red Octane) was quoted as saying there will be “multiple territories...will not see Rock Band this Christmas.”
Damn you EA! DAMN YOU!