We originally heard that Samsung's next flagship Android smartphone was codenamed "Project J" and that it will include plenty of goodies, including a Exynos Octa processor, wireless charging, a large 4.99-inch 1080p display, Android 4.1 Jelly Bean and more, but now SamMobile says it has confirmed several of those details, and has even firmed up a release date.

The site said Tuesday morning that the Galaxy S IV is currently codenamed the "Altius" (model number GT-I9500) and that Samsung is aiming to get it out on the market around April 15, or during week 16 of this year. It will indeed include wireless charging, although we assume a wireless "charging kit" mentioned in the article will be sold as a separate accessory. Samsung currently has plans to sell the phone in black and white, too. Better yet, it's expected to pack a large 2,600mAh battery, which will no doubt be required to power the battery hungry display and processor.

SamMobile confirmed that this will not be a Mobile World Congress announcement, which is no surprise to us considering we've already seen its first half 2013 road map without any mention of the Galaxy S IV, and that the phone will likely be revealed during a separate "Unpacked" event.

Of course, these plans may be concrete now and could change at any minute. Any delay from a supplier or in the manufacturing process could push the date beyond April. Still, it looks like Samsung has a big spring/summer on its hands.