Wow that diff is tiny, I would also love to see the guts in it, from what I read though will it take modern mod power when it's that small?.
On the Photon chassis, from what I have seen there is an old and new LiPo chassis, old has no holes for LiPo lugs, new does and it also has a full cut out around motor with bolt on brace bit.
In terms of kits some confusion seems to surround what version will come with what chassis now, although it looks like no new chassis will come with the tricky new looking aloy lipo mounts or strap.
Still I think I may be happy with just the normal version, and then get the 'full' LiPo chassis 'kit' with all the new bits, but that does push the price into other brand ranges.