Eagerly waiting, biting one's nails and getting extremely excited once it's there: This day was like Christmas for almost all DotA/Dota 2 fans. Icefrog released the 6.75 changelog and it is as impressive as the 6.73 changes. Even without the addition of the two new heroes, this changelog has a big impact on the game and maybe an even bigger one on the meta game.

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An excerpt from "6.75 changelog content analysis"

Ancient Apparition, a supporter that is casually picked, has been buffed. It may not seem significant, but if used correctly, Chilling Touch can now become useful, as opposed to being rather useless before. The way it works, you stack up damage when using it and now it also works on creeps, meaning it improves AA's last-hitting a lot. Ancient Apparition could be seen being a viable Mid-Hero now. Na'Vi's Dendi has done it before and now it makes even more sense. His attack animation is good, now he deals some solid damage and a fast level 6 on AA can setup some good ganks.

Another notable change is the buff on Clockwerk's Cogs. While Force Staff still pushes a hero out of it, said hero will still be pushed and has his mana and HP burned. Clockwerk will probably still not have any impact in the competitive scene, but this buff might at least put him in the pool of occasionally picked heroes.

Doom Bringer could make it as well into that pool, as his devour is now not level restricted anymore. He is already a good farmer, but this makes his farm even faster. He could easily farm on the lane and eat a jungle creep on the side. Going into the jungle from the start could be an option as well, but his low mana regen and pool makes it quite hard.
Full article: 6.75 changelog content analysis