I'll try to express my thoughts about recent Bitcoin growth.
1) CBOE and CME Group decision to launch Bitcoin futures, which would bring more institutional investors;
2) November and December Bitcoin forks (among which I like Super Bitcoin the most as it will include Smart Contracts and Lightening Network);
3) Extremely high demand by individuals (probably, speculative). Bitcoin mania – "How to buy Bitcoin" was the second most asked 'How to' question on Google search this year.
In addition, NASDAQ and Tokyo Financial Exchange are planning Bitcoin futures launch. Moreover, after the successful launch of Bitcoin futures on CBOE, confidence in the cryptocurrencies has increased. Thus, I believe, the emergence of futures for popular altcoins - primarily on Ethereum and Litecoin - is almost inevitable.