Keep in mind that Tegra 3 is a strong contender both in Nvidia's support of it, production, and industry knowledge as it was the first real quadcore option and the first tablet ready SoC. But that said its old, made on an old process, using already replaced architectures. The Tegra 4, Krait, Exynos 5, Imap 5, and the A6, are all either available or soon will be and are all leaps and bounds better then the Tegra 3 (well maybe not Krait but its pretty fast).
The other problem with Clovertrail is that its a horribly slow CPU for running x86 code, I would rather have a Tablet/mobile OS that acts like a mobile OS, then be tempted to run normal software and be pissed about the experience. Windows RT is about media consumption, Windows 8 on Clovertrail is about keeping the Netbook experience alive in Tablets, which generally means that quality wise I really expect those to get the short end of the stick in development.