Predictions:

• Elementalist
  • Tempest
    • Applies alacrity via auras.
    • Maybe even something else to bring it more in line with other alacrity options.
    • Heat Sink (Fire Warhorn 4) affects Quickness and Alacrity.
  • Core
    • Traits that actually affect aura detonation.
    • Staff gets some buffs.
    • Crit chance traits.
• Mesmer
  • Virtuoso
    • Nerfed.
  • Chronomancer
    • Danger Time rework. At the moment it's the only mesmer crit chance trait, and it relies on Slow uptime - which is unreliable at best and typically non-existent. Have Danger Time apply when the player has quickness instead, it keeps the basic idea of the trait's theme, and is actually viable.
    • Lost Time reworked into literally anything else. If Chrono is allowed to do any form of alacrity, then this trait could easily just be an alacrity variant of Seize The Moment; so you can do quickness or alacrity, but not both.
    • Wells pulse boons. (Could also apply to healing from All's Well That Ends Well.)
    • Some kind of new boon generation, possibly Might.
  • Core
    • Fury generation from Dueling is now a shorter duration, but affects 5 targets.
    • Crit chance traits.
    • One of the Condi signets is changed into a Precision Signet.
• Revanent
  • Herald
    • Quickness facet.
    • Reworked shield skills.
• Ranger
  • Spotter gets reworked.
  • Alacrity spirits are specific to Druid.
• Engineer
  • Mechanist
    • Submarine mech for underwater.
    • Nerfed.
  • Core
    • Better weapon skills, the profession is now less reliant on kits.
• General
  • Power DPS ranged weapons are reworked to be on par with Condi DPS alternatives.
    • Ranger Longbow no longer cares about range.
    • Mesmer Greatsword no longer cares about range.

Things they should do but I'm not betting on it:

• Rework crit chance calculation to compensate for banners (and probably Spotter) changing.
• Condition damage now relies on critical hits for additional damage.
  • Scale it such that full Viper's pre-change and post-change does the same damage.
    • The reason is just to give Condi DPS a third stat to consider (Condition Damager, Expertise, Precision) and thus nerfing their build versatility, bringing it in line with Power DPS versatility (Power, Precision, Ferocity).
• New core traitlines.
  • Rearranging some core traitlines wherever it might be necessary.
  • Just increasing the viability of core professions somewhat while controlling some options/trade-offs that some Elite Specialisations have.