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This was leaked to me by a friend, as part of a bet. There may be inaccuracies as a result of misinterpretation.

Season 17, Season of the Broken

Season revolves around eramis unfreezing and enacting revenge on the last city, ends with her death and the remnants of house salvation plotting something...

Seasonal exotic: Rii's Salvation
A stasis bow, that causes a freezing pulse on precision hits, killing a target with stasis damage loads an explosive stasis arrow that functions a bit like a coldsnap grenade. Catalyst: freezing a target gives you a damage boost and spawns a stasis crystals on top of it. In pvp, the freezing pulse gives 50 slow stacks instead of freezing. 

Iron banner rework, very similar to the trials one. A new Iron banner playlist, centered around highly competitive gameplay, that awards adept weapons. 

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Seasonal activity 3 man activity similar to forges called "Ketch Warfrare", involves killing mini-bosses to spawn scorch cannons, to shoot down a house salvation ketch. 

30 new legendary weapons (all of which are craftable), including a stasis special gl with chill clip. 

Solar 3.0
Still in early development (will likely be underdeveloped on release)
Well of Radiance nerf, no longer provides a damage buff
Blade Barrage reverted to it's state in forsaken, with a damage buff.
Aspects are rather underwhelming [heat rises and icarus dash are standalone aspects for example (although heat rises gains a healing effect similar to well of life)]
Hunters once again receive the short end of the stick. 
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Brand new Stasis aspects and fragments.
Hunter Aspect: Crystal scythe
Killing slowed or frozen targets spawns a crystal scythe, which can be thrown to freeze enemies and deal damage or uses as a melee weapon that slows targets (50 stacks). Spawning scythes works like spawning warmind cells, 3 points are required to spawn one, minors kills grant 1 point, major and above grant 3. 
Warlock Aspect: Frost Implosion
Melee ability now causes a freezing explosion on hit and gains a second charge, freezing enemies regenerates some melee energy. 
Titan Aspect: Absolute Zero
Destroying a stasis crystal causes a freezing pulse. 
Fragments:
Whisper of Consequence: freezing a target spawns a stasis crystal on top of them, depending on it's rank (minor - small, major - medium, elite and boss - large) -10 discipline -10 strength 
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Whisper of Durability: picking up a stasis shard grants damage resistance for ten seconds, +10 resilience (damage resist similar whisper of chains).
Whisper of Commitment: stasis shards restore grenade energy in addition to melee energy -20 discipline. 
Whisper of Regrets: Your weapons slow targets when at critical health or when you have an overshield (number of stacks depends on fire rate). 

Season 18, Season of the Plague.

My friend told me that the team really didn't want to make this season, but were forced by upper management due to "popular demand".
As a result, expect this season to be rather half-baked. Hope you are happy whoever keeps suggesting this shit.

The season revolves around rasputin being uploaded to an exo body and recovering access to it's arsenal, including siva. 
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The remnants of house salvation have recovered a lost cache containing a strain of Siva, the season ends with you stopping them and rasputin recovering siva. A darkness infused strain of Siva is teased (please no siva subclass). 

Plaguelands come back, including a re-issued sepiks perfected strike. This years remastered raid is wrath of the machine, remains largely unchanged, unlike VoG. Raid exotic - Special grenade launcher with 6 shots (like a heavy one), which explode into nanites, deals more damage against enemies with nanites on them (synergizes with outbreak perfected). 

Seasonal exotic: Young wolf's howl - A remaster of a D1 classic, element and heavy attack depend on your subclass (for example, going solar will make it solar and give it the heavy attack from back during D1), catalyst gives it a special property depending on your subclass (slowing enemies if stasis is equipped, weakening if void is equipped etc.)

Arc 3.0
Development has apparently barely started, but Hunters will get a new super (the arc staff block is merge into the regular one, similar to sentinel shield).

36 new legendaries and a bunch of older seasonal weapons re-issued as craftable versions with some new perks. 
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