As much as I would love for them to remake these games I don't think they will. Nintendo isn't one for remaking games over and over. I am honestly surprised they chose OoT to remake for the 3DS. But if it comes to be you can bet I will buy them.
Actually Nintendo remade evry main 2D Mario game twice and they remade A Link to the Past, Link's Awakening and Ocarina of Time (the Master Quest)... Without mentioning the re-releases on GBA and GC.
Anyway none of them featured significant differences, (I also think OoT3D won't) so it would be something new to the series... To me OoA is maybe the best of all Zelda games, so I'd love to see it remade! PH/ST style would fit perfectly, because it is basically played 2D style.
Also I hate how game companies always remake the most popular games to get advantage of their fame, but they don't remake the games that could be improved! See the Street Fighter Series! They released a million versions of SFII, an already good game, but never remade the first one! Same with Zelda and OoT!