[?] Optimus G Pro questions

Lg-optimus-g-pro_medium

via i-cdn.phonearena.com

Thinking about buying the OGP off contract asap for use in the US. Is this possible? If so, does it support HSPA+ here on providers like Straight Talk? Will it be compatible with ROMS that inevitably come out for the US model OGP?

Anything I've overlooked or failed to ask?

If what I want is a spec'd out top tier 5.5" IPS device with minimal bezel and 13MP camera, is there any reason I shouldn't get this immediately (e.g. the US version or an equally compelling device releasing next week, and will be cheaper and better supported)?