Pokémon HeartGold isn't out yet.
And anyway you can't change language in a Pokémon game.
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No. You can't change languages. Even in SoulSilver.
Yes, you can. Pokemon HeartGold uses the time from your DS settings. So, change the time on the DS and the time in Pokemon HeartGold will change with it.
Unfortunately, you can't change gears on bikes in HeartGold.
No, the language on Pokémon HeartGold cannot be changed to another language if you're playing a different language game except through means that aren't legit.