In the latest snapshot post, Jeb hopes to have the 1.4.6 pre-release out by next week (maybe). 1.5 won't be out until early next year.
BTW, you can download the current 1.4.6 snapshot (12w50b) from http://www.mojang.com and run it by replacing minecraft.jar with the one you downloaded. MAKE SURE TO BACK UP YOUR OLD ONE FIRST!!!! Then, if you want, you can switch between them as you please.
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Quote from Albert Einstein »
There are two things that are infinite: the Universe and Human stupidity. And I'm not so sure about the Universe.