Most likely this will mean that come July 1 the various reader apps will update to remove links to their bookstores . A bit inconvenient but not too bad. I suspect there was some hard bargaining behind the scenes by Amazon and BN. I also think that the moves by Playboy and FT to build web apps independent of the ITunes store played a part. Look for more concessions as Apple moves to build it's Newsstand service into IOS 5.
Competition is good.