No, you're perfectly right. And while HP may be up to date right now, it'll be out of date next month and it will keep getting more and more obsolete until the next release in a year or so.
To quote the release announcement http://www.haskell.org/pipermail/haskell/2014-August/024284.... (Mark Lentczner):
"I realize this one was a long time a'comin'. I take the responsibility for the decisions that lead up to being this late, including deciding it was worth it to wait for GHC 7.8, and that this was the right time to re-write the platform build system. I hope the speed that we can now turn the platform will be evident in future releases."
I've heard that about Haskell Platform releases for 2 years now. I doubt that's suddenly going to change.
[1] http://www.haskell.org/ghc/download [2] http://www.haskell.org/cabal/download.html