This article explains you why the naming conventions:
There's no x86-64 release because there's no need for it.
Quote:
The x86-64 specification was designed by Advanced Micro Devices (AMD), who have since renamed it AMD64. Intel has implemented it under the name Intel 64 (formerly EM64T or IA-32e) in its own x86 processors.
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As far as it concerns the differences between Solaris 10, Solaris Express Community Edition and OpenSolaris, I suggest you to read FAQs on
www.opensolaris.org which give you an overview. Many threads on LQ are about the same subject, too.
Bye,
Enrico