Fanless Tech just posted slides of Skylake-U the ultraportable version of Skylake, all of which have an impressively low TDP of 15W which can be reduced to either 10W or in some cases all the way down to 7.5W. As they have done previously all are BGA socketed which means you will not be able to upgraded nor are you likely to see them in desktops, not necessarily a bad thing for this segment of the mobile market but certainly worth noting.
There will be two i7 models and two i5 along with a single i3 version, the top models of which, the Core i7-6600U and Core i5-6300U sport a slightly increased frequency and support for vPro. Those two models, along with the i7-6500U and i5-6200U will have the Intel HD graphics 520 with frequencies of 300/1050 for the i7's and 300/1000 for the i5 and i3 chips
Along with the Core models will come a single Pentium chip, the 4405U and a pair of Celerons, the 3955U and 3855U. They will have HD510 graphics, clocks of 300/950 or 300/900 for the Celerons and you will see slight reductions in PCIe and storage subsystems on teh 4405U and 3855U. The naming scheme is less confusing that some previous generations, a boon for those with family or friends looking for a new laptop who are perhaps not quite as obsessed with processors as we are.