There seems to be some confusion surrounding Merrifield and Bay Trail. It seems there was a leak last year and a re-hashed one again yesterday that show Bay Trail being delayed a few months (to be introduced in early 2014 instead of end of 2013). Because Bay Trail will be manufactured on 22nm, it seems some people are assuming that Merrifield, also manufactured on 22nm, is being delayed until 2014. However, from my readings Merrifield has nothing to do with Bay Trail. I believe Merrifield is a redesign of the Medfield. I think Intel has decided to scrap the z2580 and will be pushing the Merrifield on smartphones and small tablets. So, IMO, the reports recently of Merrifield to be introduced at the Mobile World Congress this February is likely true.
You are adding to the confusion, those new benchmarks were due to a chip that has a Power VR 544MP2 gpu, that can only be Z2580/Clovertrail+ as Merryfield/Bay Trail use Intel HD graphics. I don't know why the AnTuTu benchmark is so high, but that PowerVR gpu is as powerful as any Apple one due to its high clockspeed (double) so that maybe a good reason.
Here are links to some articles I read regarding Merrifield:
There's also very little information on Clover Trail+. We know Clover Trail+ will be coming in 2013, but the big question for me is - will it be manufactured on 22nm or 32nm? From a recent interview with Mark Bohr in December, 2012, he said:
"You'll see some pretty impressive SoC products coming next year on the 22nm generation"
Note the plural usage; this might suggest that the Clover Trail+ might be 22nm also.
As you can see, Intel is attacking the smartphone and tablet markets using a multi-pronged approach. They will have Merrifield in smartphones and Clover Trail+ in the larger tablets and hybrid PCs. For the 7" tablet, they can either use the Merrifield OR the Clover Trail+.