Is it possible to install Google vanilla Android (Nexus OS) to S4, HTC One, & Sony Z?

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http://forums.androidcentral.com – Now that we see that Google is also selling Samsung S4, HTC One, and Sony Z with Google own Nexus OS, i am just wondering if I buy these phones from AT&T, would I be able to install the Google OS onto these phones? One reason that is holding me back from buying Android phones is the bloatwares. I have Galaxy S Captivate, and the bloatwares irritate me. I also own Galaxy Tab 2. While the bloatware is minimal on the Tab 2 vs Captivate, but I am still somewhat irritated me as I am not able to completely delete them (only disable). I own iPhone 5 and just bought Blackberry Z10. Both (HowTos)