I don't quite think you get my point. Kabini uses massive amounts of power compared to baytrail for comparable CPU performance and superior GPU performance. Yes I have seen the benchmarks, 15w kabini is too slow to play almost all modern 3d games. Atom is much too slow but considering its market and power use its acceptable.
Sata a bit of a letdown but PCIe on a Soc as weak as kabini is a bit of a waste. Kabini's CPU isn't really powerful enough to power a lot of games. IMO kabini should have used dual channel RAM instead (increase in igp performance).
In a cheap notebook sata support will matter, but in ultraportables PCIe probably isn't going to be used.
By the time you drop down to the a6-1450 or a4-1200 CPU performance is really weak (lets not forget that 1 ghz jaguar is worse than 1.6 ghz bobcat), GPU no longer holds an advantage, and we are still using the same as or more power. Not seeing any advantage there.
I'm saying this is significant because this effectively writes AMD out of the tablet x86 market. For cheap notebooks, Baytrail basically offers bobcat gpu performance with kabini CPU performance and much lower power envelopes. Kabini was good for netbooks, baytrail is great. Kabini still has a bit of a market in low cost, low performance notebooks but baytrail takes netbook (because this SOC will easily run without active cooling vs 15 watt soc with active cooling) leaving kabini between pentium/i3 SV (high energy, higher performance, similar though more expensive prices) and haswell ULV (low energy, higher performance, expensive). Haswell ULT takes the high end, i3/pentium takes the low and clunky end and baytrail takes the ultra small form factor section. Where does that leave kabini?