Lenovo's still being vague about a release date for its ThinkPad Helix, but it's at least narrowed down the retail window somewhat. Though the 11.6-inch, 1080p Ultrabookhad already been officially delayed and marked for a Spring release, the company is now confirming via its Twitter account that consumers can look for it to launch sometime in April. That's specifically for the US market, as no other word on overseas availability has been announced. When it does finally go on sale stateside, look for the reversible Windows 8 device to carry a $1,499 price tag and potential AT&T-friendly LTE.