I understand BCC/BCH is similar to lumen (but 1:1 ratio based airdrop).
BCC/BCH is just an altcoin is being created with air drop plans based on snap shot of blockchain as of August 1st 2017 12:20 UTC.
Yes, it will be a new altcoin with exact specifications similar to bitcoin but with 8MB block size and with other segwit proposals and finally it will start its life with pre-mined blocks. (pre-mined blocks are being copied from bitcoin's blockchain).
Why big hype on BCC/BCH and how they will survive 51% attack ?
Great question. Bitmain the chines ASIC manufacture and mining pool operator are the main party pushing for this alt-coin. I belive they hold over 60% of all mining hardware and may have backdoors/kill switches in the vast majority of privately owned mining hardware.
Depending on how much of their mining hardware is redirected toward this new altcoin could cause temporarily a slow down in the Bitcoin Netowrk transaction confirmation mechanism. The creation of new Blocks will be slowed from its current time of like 7 to 10 minutes to hours.
This is what has people worried.