World's 1st Dual Slider. By World We Mean USA. By USA We Mean Officially Announced By A US Network. Oh Just Stop Being Pedantic.
Note the qualifier - whilst the Nokia N95 has a dual slide mechanism it's along the same plane, and doesn't cover QWERTY.
However, this announcement does rather ignore the Samsung F520, announced back at 3GSM this year offering... a dual-slide mechanism with traditional numeric keypad and a separate full QWERTY keyboard. Guess Ocean's PR droids missed that one when they were writing up the release, or felt that "world's second" or "a phone a bit like the one Samsung announced a while ago" just didn't carry the same punch.