CFexpress is still the hottest memory card format on the market, and the most sizzling cards are those built to the CFexpress 4.0 standard. Compared to the last generation (CFexpress 2.0 - there was no 3.0), CFexpress 4.0 cards are twice as fast, with Type B cards topping out at around 3,600MB/s read speed, while write speeds are nudging 3000MB/s.
CFexpress 4.0 Type A cards should also be available soon, as we've seen Lexar announce Type A 4.0 cards at CES, while Nextorage had examples of its Type A 4.0 cards at the CP+ trade show - see video below. Both Type A cards are likely to offer around double the speed of today's offerings, meaning read/write speeds should top out at around 1600-1800MB/s.
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