In announcing the release of iOS 4.3 on March 11, Apple has explicitly excluded CDMA iPhone 4 from the list of supported devices, indicating that a separate build will be provided afterward.
The new iOS 4.3 release will officially support the 2009 iPhone 3GS, the GSM iPhone 4, third and fourth generation iPod touch, and iPad models. This leaves out the CDMA iPhone 4 as well as Apple TV (which is normally updated on its own, independent schedule).
The Verizon iPhone 4 was released using its own software build, labeled iOS 4.2.5. Other iOS devices remained at iOS 4.2.1, which was released in November. Apple subsequently updated Verizon iPhones to iOs 4.2.6 to fix a bug related to its new Personal Hotspot feature.
Apart from the brief exclusive of its Personal Hotspot feature, the Verizon iPhone is being updated separately because it uses a different baseband chip than other iPhones, requiring a separate firmware. Apple may be waiting for Qualcomm to deliver a specific update for the chip before integrating the new firmware into the iOS release for that model.
Apple hasn't announced a date for the Verizon iPhone release version of iOS 4.3, but it is likely to follow shortly after the initial release for GSM iPhones because the new build packs a variety of features and improvements.
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