currently the android os is 32bit?
will it come out with 64bit version?

how about ios and wp ?

The OS depends upon the CPU so once 64 bit phone chips come out then you'll likely see 64 bit phone OSs.
http://en.wikipedia.org/wiki/ARM-64#ARMv8_and_64-bit
Of course since virtually nobody installs an OS on their phone, and ARM dose not have the same features and limitations of x86, it may not be particularly obvious when they come out.

Probably.

Once one becomes 64 bit, marketing will set in and, within a few years, it will become difficult to persuade people that a 32 bit phone OS is adequate.

IPhone 5S is using 64bit CPU, is it necessary?

I am thinking of switching to WP 8 phone, is it better than android?

Ah, the great future computer switcheroo!

Note that "Probably." was the answer to the question that you asked, rather than telling you anything that you wanted to know. the distinction may be lost on you just right now.

In the same spirit:

No. None of the iPhone line has been necessary, the 5S more than most.

I think I have two answers, although, if I think about it more maybe some others will come to me.

1. In what way?
2. No. As it isn't a thing, in any worthwhile sense for this argument, it cannot be a better thing than anything else.

Please choose your line of debate. And explain your question to at least the extent that it is clear and means something.

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I was pointed to the article Inside Apple's 64-bit iOS 7 and the prospects for a 64-bit Android a couple of days ago. It may give you some useful insights (or not, of course). Until Android devs come out one way or the other, we may never know...

In terms of Windows phones vs Android phones, what would a Win phone do that an Android phone doesn't - only you can tell us which is better as only you know what you want to do with it.

OK, I'll try turning this around: Why are you thinking of switching to WP8? That is, what advantage do you anticipate or hope for?

So, for example, you could argue that a simple phone works quite well, and, to fulfil the requirements of someone who wants a plain old simple phone a very cheap solution with good battery life would be quite a plausible answer. So, if you are prepared to pay a price (monetary price as well as the other, more metaphorical, types of price) there must be some reason, some perceived advantage or advantages, in doing this.

What is this or are they?

Without knowing what, for you, this would encompass, it is impossible to say what will give you the most of it. That should be clear.

WP8 is at least a version of an operating system. Android isn't that. Neither of them is a phone. So, obviously, you couldn't say which has the better camera, better battery life, better selection of apps, more memory, better processors, better packaging never mind which offfers the better value on your local market. And, as you have also made it completely unclear what your priorities are, then offering any advivce is quite hopeless.

In what way would a 64 bit version help with your requirements? Or, in what way would you get an advantage from this, if it was available?

It is difficult to say that but as google has recently launched the android kitkat 4.3. you will soon see the 64 bit mobile in your hand.
currently every mobile company is switching to the latest series. so you will see soon.

Currently Android is the king in the Mobile OS industry. But currently people switching to other OS like IOS and WP. I have personally used Nokia WP and its really a nice phone.