For now ASRock is the only motherboard manufacturer that has a mini ITX X99 motherboard in its portfolio. This allows for some rather interesting builds but nevertheless you should be a aware that you'll have to make some compromises with this little beast.
Until today, ASRock is the first motherboard vendor that has an ITX X99 motherboard in its portfolio. Since with this form factor space is very limited, ASRock tossed two memory slots, meaning that only dual channel memory is supported instead of quad channel. Apart from that we're really curious to find out what features equipped this board with. On another note, this particular board allow for a comparison of the effects of dual channel to quad channel in combination with the X99 chipset.