New ArenaNet news post: https://www.guildwars2.com/en/news/colin-johanson-on-guild-wars-2-in-the-months-ahead/.

Some additional clarifications:
https://forum-en.guildwars2.com/forum/game/gw2/Will-existing-achievements-get-converted/1213373
https://forum-en.guildwars2.com/forum/game/gw2/Will-existing-achievements-get-converted/1214070
https://forum-en.guildwars2.com/forum/game/gw2/Will-existing-achievements-get-converted/1214179
https://forum-en.guildwars2.com/forum/game/gw2/Will-existing-achievements-get-converted/1232053

Summary:

• Achievements will start earning crowns, that can be used to buy gear/consumables/etc. (Initially daily/monthly only, expanding to all achievements). These crowns are account wide, and do not take inventory space (show up like karma/money on the inventory interface, but account-bound not character-bound)
• Daily achievements will start having variation, and eventually become a “do 4 of 6”.
• Adding guild quests
• Expanding events throughout existing world areas
• Improving the “looking for group” tool to make it easier to find other players to play with in the game.
• The improvements and fixes to the Fractal dungeons, detailed in Isaiah Cartwright’s blog post here.
• “Improving reward systems” so that players are encouraged to revisit past world areas
• Paid server transfers/guesting
• Culling improvements/reduction of culling in WvW
• “A system of prestige and advancement specifically designed for WvW”
• sPvP observer mode, ranking, ladder, custom/hosted matches

Note that this is the long-term plans for the first 1/2 of this year – not all of it is going to be released this month ;). Exact dates for any of it haven’t been specified…