Guild Wars 2

So here is my last minute theory:

We lose the ability to swap pets. Instead, F3 would gain the ability to switch out the pet in combat by transforming it into an oakheart which changes the rangers F keys.

The oakheart would have devistatingly strong hits but would be slow, requiring some hadd control to set up. Staff could offer this type of skill set. The oakhearts would radiate an aura to impact foes or allies based on the Aspect spirit the ranger has infused into the oakheart. Even if it cant land attacks it will be providing a benefit with its auras.

F3 Infuse Spirit – Transforms pet into a oakheart and heals to full. Changes into Release Spirit to change pet back to its beast form and heal to full. Triggers all swap traits.

F1 becomes Command. Changes weapon hot bar temporarily to 5 command options:
1- Attack target / 2- Defend Me / 3- Guard Location / 4 – Retreat

F2 becomes Aspect Shift. Changes weapon skills temporarily to allow the Druid to select from one of four Aspects to imbue their oakheart with. Each drastically changes the base stats of the oakheart and pulses a buff to nearby allies. Switching Aspects has a timer and triggers pet active ability traits. Maybe some big flashy effect could happen on switching into an Aspect.

Aspect of Bear – Oakheart gains large toughness, vitality, and power increase. Aura redirects 50% of ally incoming damage to oakheart. Glyph skills shift to bear aspect. Attacks will Taunt foe for 2 seconds with 10 second cooldown and grants 5 seconds of Protection and Retaliation to allies in range.

Aspect of Jaguar – Oakheart gains large power precision and ferocity increase. Aura increases damage received by foes by 15%. Glyph skills shift to Jaguar aspect. Attack will apply 5 stacks of vulnerability per hit and gain increased attack speed for oakheart.

Aspect of Moa – Oakheart gains large Healing Power, Boon Duration, and Toughness. Aura reduces condition damage and duration received by 20% and continually heals nearby allies while periodically transfering conditions to itself. Attack will apply 5 stacks of Might and Fury to allies in aoe for 10 seconds.

Aspect of Devourer – Oakheart gains Condition Damage, Condition Duration, and Precision. Aura causes affected allies conditions to be extended by 2 seconds and changes the oakhearts attack to a ranged gunk throw from 1200 units that applies poison and bleeding.

I think choosing druid will simply replace your 2 pets with 1 oakheart.

The oakheart then has another F-skill (cuz no more switching) and maybe even an F5 skill.