https://blog.bitmain.com/en/uahf-contingency-plan-uasf-bip148/Bitmain is announcing that if BIP148 succeeds, then they are essentially going to mine a new SHA-256 altcoin instead of Bitcoin. If you don't do anything, it'll be as if mining power dropped somewhat, but you'll otherwise be completely unaffected.
I feel like some people might read this statement as trying to force a decision between Bitmain's altcoin and BIP148, but you should be roughly equally unaffected whether or not you enforce BIP148. It might help BIP148's chances a little due to removing Bitmain from consideration and therefore increasing the chances of activating the traditional BIP141 SegWit deployment, though I continue to be pessimistic about BIP148's chances; I consider continuation of the status-quo and a somewhat later BIP149 UASF as the most likely outcome.
I kinda doubt that they're actually going to stick by what they say here, but if they do, it only seems like good news. If you'd like to use a currency controlled by a single company that puts its ability to use its patented Asicboost tech above all other considerations, feel free! I'll stick with Bitcoin, thank you very much.
And this is what I've been telling many times myself, namely, that miners (Jihan Wu's puppets, specifically) will leave no stone unturned to escalate things further (to keep things where they are now). But I don't think that they are really going to stake everything when the time comes to decide and actually follow their decision. This will just turn out the same bluff as it has always been the case before with miners and the stuff they have been proposing (like BU and similar bullshit)