Samsung's powerhouse line Galaxy should be seeing it's newest phone, the S4 (or quite possibly the S IV), as soon as April 15th.

Samsung is not commenting on the rumored launch date, but SamMobile seems pretty sure the next device called the "Altius" is actually the S4.

The biggest feature the S4 will have is wireless charging...but it won't be built-in.  You'll need to fork over some more cash to buy a wireless charging station and replacement cover for that already-expensive phone.

The battery is also supposed to be bigger than the battery in the S3.

Other rumored features from SamMobile are: 4.99" display, 13 megapixel rear-facing camera and a 2 megapixel front-facing camera (both capable of shooting HD videos), and Android Jellybean as the OS.  It will come in black and white.

These are the confirmed details:
Code Name: Altius
Model Number: GT-I9500
Colours: Black / White
Battery Capacity: 2600 mAh
Special: Wireless Charging Kit

And there you have it.  We'll keep you updated on any new details.