For the lazy:
PSYLOCKE
Psylocke's "Secondary Resource" has been converted to a damage shield mechanic now known as Psionic Barrier. Her current psionic weaponry powers have been altered to be spirit spenders instead, with several new affixes and mechanics in place. This opens up her most unique powers (Psionic weapons) to be used as often as possible.
Assassinate and Shadow Dash have been sped up to lightning fast, near-instant speeds, more accurately representing her ninja-like agility. Overall, Psylocke's stealth capabilities have been improved upon, including adding a non-breaking stealth component (invisibility) to Shadowstep.
The Psionic Projection mechanics have been wrapped into a single passive, freeing up many power points for players who wish to build around the shadowy decoys. The Decoys have also learned some new moves, and are able to mimic two more powers.
Deadly Assassin can now be toggled on to swap the visuals of all Ninja Assassin katana powers with Psylocke's iconic, deadly Psionic Katana. Note that this effect does not convert the powers to mental damage, so current itemization will not be affected.
STAR-LORD
The Element Gun tree has received some updates in order to help promote it as a viable, fun alternative build choice. Whenever Star-Lord has Elemental Ammo loaded, the Element Gun powers that consume Ammo will no longer consume Spirit as well. Only Ammo will be consumed.
In addition, the Elemental Blast power no longer uses a charge and hold mechanic, but rather is a powerful short cooldown burst of damage.
Other affixes on Element Gun powers have been adjusted and improved in order to make all four elements able to be built around and used in various situations.
GHOST RIDER
Ghost Rider's mechanics have been tweaked and improved in order to improve his rotations and overall damage capabilities.
The ranged power Hellfire now applies a stacking DoT effect, and is the point of reference for all powers that talk about enemies being 'affected by Hellfire'. Spirit of Vengeance no longer applies Hellfire; however, many of Ghost Rider's powers now apply stacks of the DoT of the Hellfire power.
Penance Stare has been significantly improved as an incredibly powerful single target Signature power.
Judgment has received some extra animations and has been positioned as the primary damage spirit spender in the Chains tree.
Chains Ablaze has been converted into a passive, freeing up bar space for other powers in Ghost Rider's rotation.
A new ranged single target spirit spender has been added to Ghost Rider's Hellfire tree, allowing ranged Ghost Rider players to have a more reliable consistent source of damage. PREVIEW:
SILVER SURFER
Admittedly, it appears the changes to Electromagnetic Flux hit Silver Surfer a bit harder than we originally intended, and we are re-analyzing EMF to see where the safest improvements can be made. (in alpha testing)
Subspace Slipstream, Board Dash, and Repulse are gaining new mechanics to flesh out the Starfarer builds.
Event Horizon is gaining some more utility to give Surfer additional gameplay options on how and when to use his Signature power.
A brand-new new spirit spending power is being introduced. This power will not be channeled, and be an attractive choice for players who prefer to stay on the move.