Android 4.3 flavors Sony Xperia Z1, Xperia Z Ultra

Sony also promises that the Android 4.3 update is "right around the corner" for the rest of its Xperia lineup.

James Martin/CNET

Owners of Sony's Xperia Z1 and Xperia Z Ultra should now start to see Android 4.3 pop up on their phones.

Sony spilled the beans about the Xperia Z1 and Xperia Z Ultra on Monday but cautioned that the actual arrival time of the Android update will vary by market and carrier. Android 4.3 offers several enhancements and tweaks for Xperia phones.

Along with an improved interface, the Android 4.3 update adds Sony's Smart Social Camera to the Xperia Z Ultra. This collection of apps brings some social savvy and other innovative extras to the phone's camera. Users will find improvements to Sony's native apps, including Messaging, MyXperia, Smart Connect, TrackID, and Sony Select.

Sony also promises better integration between its Walkman, Album, and Movies apps and its cloud-based Entertainment Network. And users will be able to customize their interface via downloadable "Xperia Themes."

When will Android 4.3 reach all of the remaining Xperia devices? Sony promises that the update is "right around the corner" and asks customers to stay tuned for more details.

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