Their focus is now on the core/home markets, so UK (ETA: should note that they're actually co-headquartered in the UK & Hong Kong, but its global HQ is indeed London) & HK/wider Asia. I don't see them pulling out of China or India, Macau by virtue of its SAR status or Singapore as a financial centre. Doesn't mean the rest of Asia is immune, or that I'm in any way right, but these are the markets from which I would be very surprised if they exited.
Expat I'm not so sure about, I don't really see the benefit of that market over and above what UK and CIIOM do (UHNW individuals and the CI tax situation, maybe); while Jersey is of course a Channel Island, HSBC Expat (Jersey) is separate from HSBC CIIOM - the latter serves Jersey residents (as well as Guernsey, Isle of Man and, I presume Alderney/Sark), Expat covers the broader expat community. That said, it would be presumably easier to roll Expat into UK or CIIOM if required (the accounts use the UK sortcode/account number format already).
USA they haven't exited - it is actually another fairly easy one to meet the criteria in (actually easier than here) - if you need USD, otherwise it's unnecessary work. I would hesitate to add that the US has the benefit of a large population and of being a financial centre; they could have jumped as they did Canada (similar but slightly larger population to us of course), but instead wound back to Premier/Private only, meaning they still see a benefit of providing retail banking services there. I could be entirely wrong though, in the longer term.