Most people might say Haskell '98, but don't really mean it, because they don't want n+k patterns, and do want hierarchical modules.
Also, the FFI is simultaneously incredibly useful and a new level/kind of unsafety that doesn't exist in "pure" '98. And, with most Haskell programs still being native (not in-browser, or JVM, or CLR, or other VM), I think the FFI might be undervalued for it's frequency of use.