As far as I can tell, for good or ill, they are re-working DnD into a new fresh form. Whether or not it resembles its predecessors is irrelevant, the change is comming, so we better get used to it.
Personally I like my dnd Fighter types modeled after boromir, Inigo Montoya, sir lancelot, and other warriors of great skill and renoun. If the new edition gives me "powers" that mimic physical attacks (like cleave or a knockback ability) then i'll be happy. If 4th edition gives me the ability to shoot fire out of my sword, then thats not what I personally consider a FIGHTER..
BUT>>> it IS what I think a fighter/wizard mix should be able to do. After reading the manuevers in book of nine swords, it felt that my fighter had become a swordmage. Which can be cool in its own right, but isnt My quintisential fighter.
As for Conan, beowulf, and other pulp/sword and sorcery fighters...well I play those type of characters in mongooses Conan D20. Magic is just too intregrated into the core mechanics of 3rd edition to pull off a convincing low magic pulp world where magic is a rare and terryfying thing.