Hinted Content

Fall 2015 Event
According to October 2015 Comptiq, Fall 2015 Event will be relatively short and easy.

Smaller Escort Ships
According to a quarterly mook 艦これ鎮守府生活のすゝめVol.1 which was released in September 2013, there are plans to implement new escort ships, and because their displacement is less than that of destroyers, they would take a younger form, but they are said to be for the final phase of the war and thus, while they want to release it as soon as possible, they have told the fanbase to please be patient about it. (That volume of mook also revealed the plan to implement Musashi, Akizuki-class destroyers, and Agano-class cruisers which are all now part of the game)
 * Status:  No signs of happening yet 
 * Source: Quarterly mook 艦これ鎮守府生活のすゝめVol.1
 * Source Date: September 2013

Shinano and Ibuki
Some online info said, According to magazine Hobby Japan Volume 2014 February which was released in December 2013, implementation of Shinano and Ibuki have been planned but there were not enough evidence to say the magazine did have stated that.
 * Status:  No signs of happening yet 
 * Source: Hobby Japan Magazine
 * Source Date: 2014 February Volume

Matsu-class Destroyers
According to magazine Febri Vol.26 released by the end of year 2014, Implementation of "Escort carrier ended with tragedy", "Matsu-class", "... of oversea ships", and "... of submarine" have been planned.(that volume of magazine also hinted the implementation of Unryuu class ships like Amagi and Katsuragi but it have not specific the amount)
 * Status:  No signs of happening yet 
 * Source: Febri Vol.26
 * Source Date: End of 2014

Foreign, Auxiliary, Matsu-class
According to Comptiq Volume 2015 April released in March 2015, in the third year of this game(Apr23, 2015 to Apr22,2016), there will be plenty of oversea ships and auxiliary ships like Seaplane Tender(e.g.the Akitsushima implemented in April 2015, [[Mizuho in August 2015). Also, in the year there will also be implementation of Type D Destroyers (Matsu-class) and its derived ship.
 * Status:  Partially Happening 
 * Source: Comptiq
 * Source Date: 2015 April Volume

Smaller Escort Ships, Auxiliary
According to 鎮守府生活のすゝめ Vol.6 released in May 2015, it stated again that escort ships will be implemented later to represent surface escort warfare but they will be for the later stages as with their equipment to show a sense of late stage battle. And as thus, this year, there will be more auxiliary ships and boats (as mentioned above), like Flying Boat, thicket Destroyers (Matsu-class) and high speed transport ships that are based on the aforementioned wartime destroyers (No.1-class landing ship), as well as some even more special ships (Fleet Oiler that can carry Aircraft: ).
 * Status:  Partially Happening 
 * Source: 鎮守府生活のすゝめ Vol.6
 * Source Date: May 2015

Non-mainstream and Unique Ships
According to Comptiq Volume June 2015, some new ships that are planned for implementation after the conclusion of the Spring 2015 Event will be "off-mainstream" or "unique", for example "Ships that forced themselves to carry aircraft" etc.
 * Status:  Happening 
 * Source: Comptiq 
 * Source Date: 2015 June Volume 

Foreign Large Ship
According to October 2015 Comptiq, Foreign Large Ship, not necessarily LSC, will be implemented in the future.
 * Status:  No signs of happening yet 
 * Source: Comptiq
 * Source Date: 2015 October Volume

Hagikaze OR Arashi
A New Destroyer is expected to be implemented in the future. A new destroyer is a friend of Maikaze and Nowaki. It is likely that the new destroyer will be either Hagikaze or Arashi.
 * Status:  No signs of happening yet 
 * Source: ?
 * Source Date: ?

Shinano
From an official twitter post in 13 October, 2013, Shinano is "completed and on stand-by for introduction, but waiting for her turn as a Standard Carrier". She is currently the last unimplemented IJN Standard Carrier, after Katsuragi's introduction in Spring 2015.
 * Status:  No signs of happening yet 
 * Source: Official Twitter
 * Source Date: October 2013

Second Remodels
According to the official Fubuki 4koma manga's attached explanation in tankoubon edition, it have been stated somewhere else that all kanmusus will get their second remodel (eventually).

Friendship System
Since KanColle launch, on top of the game's main screen, it have a greyed out button with text saying "friendship system" and "to be implement in phase 2".

Mobile Devices
According to early 2013 news report, there were plan to support flash-enabled android tablet and smartphone, but official site do not currently include relevant content.