I am really, really excited for the wipe. If you are too, you may also have found yourself looking for a summary of what's to come, so I tried my best to put one together. Sources are listed at the end. Point out anything I missed with a source in the comments and I will add it. Lastly, Nikita, if you do happen to stumble across this, feel free to tell me what I missed 😉
[ENGINE]
-Game migrated to a newer (2018) version of Unity.
-New grass rendering (longer draw distance, better performance)
-New explosion effects
-Added TAA
-Added HBAO
[HIDEOUT]
-Added hideout, a map for your PMC to exist between raids.
-Added off-raid healing.
[MAPS]
[Military Base]
-Added new map (Military Base).
-Includes Scav boss + guards
[Woods]
-Added ambusher Scav Boss
-Added Scav boss' stash
[Misc.]
-Added other new Scav bosses
-Added new exfils to existing maps
-"Needed changes and fixes to old locations"
[WEAPONS]
-Added new stationary weapon (UTES+AGS).
-Added Beretta
-Added p90
-Added Ash-12
-Added Five-Seven ("High Chance", not 100% confirmed)
[MEDICAL SYSTEMS]
-Added Surgical Kits, which can revive a black limb mid raid
[OTHER ITEMS]
(0.12 is "the biggest patch in terms of items")
-Added new rigs
-Added new backpack
-Added some glasses
-Added barter items
[QUALITY OF LIFE]
-Added weapon "builds" system, which will allow you to save weapon configurations and buy them again with one click.
-Rehauled 3rd person animations
-Many bug fixes. Real patch notes for this will be "huge"
[CHARACTER CUSTOMIZATION]
-Added 5 unique outfits for each PMC faction. Outfits will be unlocked in a similar manner to trader levels.
-Polished first person hand models
[TRADERS]
-Added new trader, Jager.
-Reworked quests: removed "grind quests" from required progression
-Added new quests
["SOME BIG THING"]
-Nikita Can't talk about it
-It has been done for a long time
-It will make us happy
SOURCES
Source: https://www.reddit.com/r/EscapefromTarkov/comments/dilz21/i_tried_my_best_to_make_012_patchnotes/