You should also include information about Segwit2x which will activate segwit via BIP 91 and then hard fork 12960 blocks after Segwit is activated.
There's no risk of that yet.
The activation of BIP 91 itself could cause a chain split since it requires all blocks after it activates to signal for segwit. Since only 80% of the hashrate supports segwit2x, these is a possibility that the remaining 20% won't be signalling for segwit following BIP 91's activation and thus cause a chain fork (their blocks would be invalid without segwit signalling).