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I think there's general agreement that cabal has limitations:
http://www.yesodweb.com/blog/2012/04/replacing-cabal
http://www.yesodweb.com/blog/2012/04/cabal-meta
http://www.reddit.com/r/haskell/comments/qdjha/which_command...
http://www.reddit.com/r/haskell/comments/r5h81/google_summer...
http://www.reddit.com/r/haskell/comments/rurn4/cabalmeta_tra...
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Not clear if you're interested in pure language design or looking at the state of standard library, editor/testing/deployment toolchains etc but as far as language design debates go vs. the SML line, you could read Harper's
http://existentialtype.wordpress.com/2011/04/24/the-real-poi...
http://existentialtype.wordpress.com/2011/05/01/of-course-ml...
The other thing is that currying + lack of parens around function arguments makes it not visually clear where each argument goes or what expressions are part of what. Only someone familiar with each function and it's arity (in some Haskell-relevant sense) could read the stuff at a glance.
http://blog.codeslower.com/static/CheatSheet.pdf
http://sites.google.com/site/haskell/notes
http://acm.wustl.edu/functional/hs-breads.php
http://www.cl.cam.ac.uk/~ns441/files/thips.pdf
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http://www.haskell.org/tutorial/
http://haskell.org/haskellwiki/Blow_your_mind
http://www.haskell.org/haskellwiki/Meta-tutorial
In short, Haskell's modernity didn't offer enough for me to consider it over Clojure.