Luxury leather case maker Vaja has just listed a case offering for a Dell 7-inch Streak tablet product widely believed to be the Dell Opus One, otherwise referred to as the Looking Glass codename. The Opus One is said to be utilizing a dual-core processor, an improvement over the 5-inch Dell Streak’s single-core Snapdragon CPU at 1 GHz. The tablet may launch at CES at Dell’s press conference in early January. In the past, Dell had said that it hopes to extend the Streak line to encompass more tablet offerings, and a 7-inch model would give Dell a competitive offering against larger tablets like the Galaxy Tab or the BlackBerry PlayBook, both of which offer 7-inch displays.