Upcoming Bitcoin forks(approximate dates):
Super Bitcoin(SBTC) - Dec 17, 2017 Block number: 498888
http://supersmartbitcoin.com/
Bitcoin Uranium - Dec 31, 2017 (Unknown Block)
Source: https://bitcointalk.org/index.php?topic=2316506
Bitcoin cash plus(BCP) - Jan 2, 18 Block number: 501407
http://www.bitcoincashplus.org/
Segwit2x(B2X) - Jan 28, 18 reattempt (Unknown Block)