In 4e the Swordmage was one of the most flavorful and best designed classes I ever played. The Swordmage accomplished something no class in D&D history had ever done. It seamlessly blended magic and martial prowess.
While the spell-blade has long been a concept in D&D, it always revolved around either casting spells or striking with your weapon. The Swordmage on the other hand casts spells by attacking with their weapon. There is no either or for the Swordmage. Their weapon attacks are spells an their spells are both unique and flavorful.
Looking at the 5e ranger and paladin makes me worried. Neither the ranger nor the paladin blend their magic and their martial prowess. No, instead they are martial characters with crappy spellcasting slapped on almost as an afterthought. If that is what the designers thinks makes for an interesting hybrid class then I do not want to imagine what the have in store for the poor Swordmage.
My 5e Homebrew Material