I do not believe in a rumor. and also about the next bitcoin is litecoin. why?
because I see LTC has a slow development, and also has no plan, so when bitcoin down, LTC prices can not survive, even down as well.
and when compared to the NEO, I prefer NEO or ZCash rather than LTC.
when did you last study litecoin? that was true a year ago but not true today
litecoin has made faster progress than practically any other altcoin in adoption and implementation to the consumer. they have multiple deals in the works for debit card processing and atomic swaps. LTC also will be able to use the lightning network and has the advantage of being known as bitcoin lite since it literally is exactly that.
neo has practically no adoption outside of the crypto space
zcash is interesting and i could see having a very bright future. it's growth in the past year is noteworthy. part of that i suspect is due to the easy of GPU mining which brings and more people to it. if they allow that z9 from bitmain to mine it, well, it's hard to say how that will go
i'm also not sure if everyone grasps what litecoin being the next bitcoin really means. litecoin in theory should be worth roughly 25% of bitcoin if it receives the same level of adoption. another next step should be trading pairs. right now BTC is the world reserve currency of crypto and ETH is hot on it's heels. for litecoin to take the #3 spot which i personally could see happening it needs to accomplish all of these things.