Have dual-core processors fully utlitized in android smart phone?

Dual core is better and future proof right now. Most dual core phone can out perform single core phones. But its really up to you though. If you don't care about speed and having a future proof phone, then go with a single core.

 

Well, as of right now, android hasn't optimized the apps for dual core phones. Meaning the apps are not really using the dual core technology the way it should be used. They are still working on this and even though there are rumors about quad core phones, You have to remember that not all apps will run using the full function o this new technology. (At least in the beginning of release). It will take time for developers and android to optimize them to run on a quad core processor. (Not to mention the different manufactures and their overlays.) I say go with a dual core right now, and then after seeing the reviews of the quad-cores, you can upgrade later next year.

 

To be honest, I don't know. I would suspect better UI and some neat features. I have an Atrix 4G and waited until Nov. to upgrade to GB. Reason was to see what kind of problems people were having and not wanting to do a factory reset. Check out this video.

Android 4.0 Ice Cream Sandwich Official Presentation and Demo - YouTube

 

Your welcome. We're here to help each other out. As far as the battery, I say wait a month or two after you've customize the phone and got a feel for it. Then see if you need the spare battery. Battery drain is really different for everybody, since we all use our phones differently. Not to mention the amount of apps and widgets. (That's a whole nother thread.) Good luck.