CPU World has managed to dig up a few more details on the Core i3-6100 and Pentium G4400. These might give an inkling of what is coming in the Core i3 and Pentium lineup.
The Core i3-6100 has two Hyper-Threaded cores and 4 MB of level 3 cache. The microprocessor supports AES and AVX2 instructions, VT-x, VT-d virtualisation, vPro, and Trusted Execution technology.

The i3-6100 has GT2 graphics which is branded as HD 530 and the GPU will run at 350 MHz. This will be clocked up to 1000 MHz.
Apparently the G4400 will be positioned as a successor to the G3250 Haswell-Refresh processor. The "Skylake" version will have two CPU cores, 3 MB L3 cache, DDR3/DDR4 memory controller and GT1 GPU. Each core will be clocked at 3.3 GH.