Just days after its CEO tweet-teased a fourth Uncarrier phase was on the way, T-Mobile has sent invites to a press event at CES 2014.

"This one you aren't gonna believe," read the magenta and black invite.

"4.0" is faded into the background, all but confirming that this is the Uncarrier 4.0 event John Legere hinted at on December 18.

The event is set to take place on Wednesday, January 8 at 12:30 p.m. at PST during the CES tech show in Las Vegas.

What's in store for Uncarrier 4.0?

T-Mobile's Uncarrier moves throughout 2013 have been well-documented - from doing-away with annual contracts to offering free, unlimited international data and texts.

T-Mobile event

T-Mobile CTO Neville Ray told us in October that more Uncarrier moves were on the way, so today's invites should come as no surprise.

What will be a surprise is what T-Mobile has in store. The most recent inkling is that the carrier plans to offer customers who switch to its network a credit of up to $350.

The new customers will also get a credit for the early termination fee charged by their old carrier, thus eliminating one of the major sticking points (or as T-Mobile likes to call them, pain points) of changing service providers.

We'll be on the ground in Vegas covering T-Mobile's news conference, so stay tuned.