Bela, could make the standard piCore-xx.img a bit bigger to have room for the wifi and soon bluetooth files.
Maybe one day detect on boot if it is a Pi 3 and have wifi/ble in the kernel boot mmcblk0p1?
Just to make it bigger without adding new files to the image has no sense, as for sure you must resize it anyhow if you add applications, and you can not tell how much space is needed. Resize when it is really needed an easy procedure, safe and well documented.
Actually RPi3 is used as an RPi2 in 32-bit mode, sharing the RPi2 repo, kernel, etc. Just adding the WiFi kernel modules to initrd would be an unneded overhead for RPi2 while an RPi3 dedicated initrd would be an extra 5Mbyte. Also for RPi3 users need the WiFi tcz's to make it usable which is not needed by others, and also wifi kernel modules are different for RPi0/RPi1. Due to different WiFi adapters, firmware, etc. WiFi always need customization.
I do not want to reintroduce multiple SD card images as it was before which makes life more complicated for both users and maintainers. Please keep in mind that TC/piCore is not a distribution but a core system say a toolkit.
Of course if one is making an RPi3 special edition it is fine. We can discuss it, check and if it fits to piCore concept and implementation we can make it available as a community version, I appreciate it. But do not want to change the current SD card structure.