That doesn't mean that Mojang will update them in the way that they want them to be - as in actually changing the terrain generation, not just adding some silly pointless features (likewise, if Mojang ever adds the fabled cave update it won't interest me if all they do is add some new mobs and ores, not actual changes to caves themselves, which were heavily nerfed in 1.7, and even then they probably wouldn't make them the way I like them).
This is also a major reason why I've never updated past 1.6.4 myself, instead using my own modding abilities to create my own vision of the game, just the way that I like it (which I see as a separate version of the game, not just a "mod" for 1.6.4). Try finding biome and terrain generation like this in 1.7 or later (note the number of different biomes near each other and mountainous terrain in more than just Extreme Hills (when people say that Beta 1.7.3 terrain was superior they are referring to things like mountains in most biomes, not just one or two "mountain" biomes). This was was also created with the first version of TMCW, which has had 3 major updates since then):
Yeah, I'm aware they wont change to be massive realistic mountains, even though they did say they'd make them spikier and have "dramatic views". I, personally, am not too excited for the terrain generation but excited for the feature of snow you can fall into - to create adventure maps this is a great idea. All I know is that mountains are somewhat changing, even if it changes one or two things, it's an update nonetheless and I'm excited for it. I was just stating that they will, in at least one way, be improved. Very interesting though!