I'm not sure if it's been posted here yet, but someone has data mined the game and here's some info from an article:
Splatoon – future weapons, maps, and mode details leaked via data mining
"One person has data mined Splatoon, and uncovered a whole bunch of information about the game. We now know about future weapons, maps, and modes.
As this may fall into spoiler territory for some, we’ll post the details and images after the break.
– 10 maps on the disc
– Only two are unreleased (Camp and Skyscraper)
– 33 unreleased weapons on the disc in some form
– Some weapons have complete descriptors (and may or may not be actually complete)
– Others which have incomplete descriptors (and may or may not be actually complete)
Weapons list:
Sploosh-o-matic – Squid Beakons & Killer Wail
Neo Sploosh-o-matic – Point Sensor & Kraken
Neo Splash-o-matic – Burst Bombs & Inkzooka
N-ZAP ’89 – Sprinkler & Inkstrikes
Custom Dual Squelcher – Squid Beakon & Killer Wail
Luna Blaster – Ink Mines & Inkzooka
Luna Blaster Neo – Splat Bombs & Bomb Rush
Range Blaster – Splash Wall & Inkstrike
Custom Range Blaster – Splat Bombs & Kraken
Rapid Blaster Pro – Seekers & Inkzooka
Rapid Blaster Pro Deco – Disruptors & Killer Wail
L-3 Nozzlenose D – Burst Bombs & Kraken
H-3 Nozzlenose – Suction Bombs & Echolocator
H-3 Nozzlenose D – Point Sensor & Inkzooka
Carbon Roller – Burst Bombs & Inkzooka
Carbon Roller Deco – Seekers & Bomb Rush
Inkbrush Nouveau – Ink Mines & Bubbler
Octobrush – Squid Beakons & Kraken
Octobrush Nouveau – Splat Bombs & Inkzooka
Bloblobber
T_BigBall_Strong01
Triple Bloblobber
T_BigBall_Diffusion01
Bomlobber
T_BigBall_Launcher01
E-liter 3K Scope
Custom E-liter 3K Scope
Bamboozler 14 Mk I
Bamboozler 14 Mk II
T_Gatling_Standard00
T_Gatling_Standard01
T_Gatling_Hyper00
T_Gatling_Hyper01
– There are also Ranked mode game type selection images (see the gallery)
– These are Splat Zones, Tower Control, Rainmaker
– All of the text for Rainmaker is already on the disc, but the leaker isn’t revealing it yet"
Here are the images:
Here's the main source from Twitter:
https://twitter.com/NWPlayer123/with_replies
EDIT: New details about Rainmaker!!
In Rainmaker, both teams compete to snag the Rainmaker.Once you've got it, the goal is to carry it into the other team's base! So as soon as the battle begins, grab that Rainmaker! It's guarded by a shield, though, so you'll need to bust it out first. Once you snag it, head for the other team's base. And be quick about it! If you run out of time or get splatted, the Rainmaker will be dropped.Its shield will also reactivate. The Rainmaker is crazy heavy, so you can't Super Jump while carrying it.Your teammates will have to watch your back! The Rainmaker can also shoot ink like an Inkzooka, so you can clear a path! The closer you get to the enemy base while holding theRainmaker, the lower your goal distance will drop. If the battle ends without anyone carrying the Rainmaker to the goal, the team with the lowest goal distance will win!
Paste bin file:
http://pastebin.com/HNkuudWz
EDIT 2: Weapon Descriptions & Images!!