U.S. carrier Verizon has sent out press invitations for its event on May 22 at CTIA Wireless in Las Vegas. It's known that the carrier will offer the Samsung Galaxy S4, but a release date is now known and rumors also suggest that the Nokia Lumia 928 will head to the carrier at nearly the same time; however, is the carrier planning something else as well?

The press invitation has the company's logo on the top, followed by "Save the date" and then at the bottom the invitation says "Join Verizon Wireless for a Special Announcement at the CTIA." The carrier does not give a slightest hint of what it's up to on May 22.

"Verizon has been a bit quiet on the events front as of late, but the company has just issued invites to a press event taking place May 22nd at CTIA Wireless in Las Vegas. It's been tough to get a reading on Big Red's roadmap for 2013, with the only device we know for sure heading to the carrier sometime soon being the Samsung Galaxy S4," reports Phandroid.

The Phandroid report also says "Verizon's Galaxy S4 release date has long been rumored for the end of May, and if that holds true then this event could be the coming out party for its version."

Verizon's version of the Samsung Galaxy S4 is expected to hit shelves on May 30 but the Big Red has not made an official announcement.

Various rumors indicate that the Nokia Lumia 928 will head to Verizon with the expected launch date to be April 25 or May 15. However, the company has not confirmed the Lumia 928.

If rumors are to be believed, then Verizon customers will have the option to select either the Galaxy S4 or the Lumia 928 soon. However, the carrier may be planning something else for May 22.