Google has sent out an invitation to a July 24 news announcement event in which the head of its Android and Chrome units is scheduled to speak.

The event, at DogPatch Studios in San Francisco, will feature Sundar Pichai, who earlier this year was tapped to oversee the development of the Android operating system in addition to running the unit that works on the Google's Chrome Web browser.

Google will kick off the event at 9 a.m. and live stream it on YouTube.

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It's unclear what exactly Google plans to announce (the invitation is one of the least revealing tech invites of the last few years), but as always, there are a few theories.

After not revealing a new version of Android during May's Google developer conference, many expect the Web giant to unveil Android 4.3. But don't count on too many things to be updated -- many believe Android 4.3 will be a modest upgrade.

Google could also introduce the next version of the Nexus 7. It was about a year ago when the Mountain View, Calif., company announced the original Nexus 7 tablet.

Another theory is that Google will formally unveil the Motorola Moto X. The upcoming U.S.-assembled smartphone has already been marketed in print ads and Google Chairman Eric Schmidt was recently seen at a conference using one, but Google has yet to officially introduce the new device and all of its features.

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