Excerpt: Like it or not, tablets are the future. Lenovo’s latest, the ThinkPad Helix , is not likely to be a part of it. Here’s why. Following on a string of successes with convertible PC designs — including the swell IdeaPad Yoga — Lenovo has now taken aim at the slate. The centerpiece of this design is a relatively standard 11.6-inch Windows 8 tablet.