I am torn myself. I hope to go to Best Buy and Staples to get my hands on each one. I like that the Yoga offers HD+, which the Twist does not (and this is likely the decision-maker for me, and the reason I did not go for the T430u), but I like that the Twist can provide a high capacity spinning disk drive. That's just not a deal-breaker for me. I am bummed at the lack of a trackpoint on the Yoga, though. But maybe with touchscreen, it's no longer a big bonus. We'll see.
As for "traditional" Thinkpad, etc. Well, I have been a Thinkpad user for a long time, for business and personal use, but I am disappointed mostly with the display resolution offerings in the "traditional" Thinkpad line. I have no issues with the new chicklet keyboards. So I guess I am just not a "traditional" Thinkpad user. Considering that I have been using a z61t for the last few years, I guess that makes sense.
Z61t:9440-A23,Win7 Ultimate 64-bit; T23:2648-8RU+512MB,WinXP Pro (ret.); T40:2373-PU7,WinXP Pro (ret.); Yoga 13 i5 (stolen)