There is not going to be any hardfork.

The whole story is that the Obelisk miners (manufactured by a subsidiary company of the Core developers) a few days ago revealed the preliminar tests on the units, and sadly the specs could be a 30% bellow the expected. As the mining network is already flooded by miners of 3 companies, by the time Obelisks are delivered their profitability will be very low (so all that speech about "doorstoppers")

The buyers of Obelisk are in rage and are pressing really hard the developing team to fork the mining algorithm of the network to invalidate every miner but Obeliks. Some buyers are going as far as considering the fork as inevitable or consider it a proven fact, I guess in hopes of shaping the reality by describing a different one.

... but the reality is that the Core team is not going to fork the network: they are stating every day that this is no reason to provoke a contentious fork, and that the decision of not forking is firm unless Bitmain/Antpool starts to behave destructively against Sia (something that can't currently happen as the hashrate of Antpool is <15%)