Linux dedicated servers are now 64-bit
Game and server builds are now threading-capable

Include Steam IDs in listplayers output
Now using LuaJIT as default Lua implementation (closed beta includes both LuaJIT and non-LuaJIT builds)
Lua command reqhttp may now accept a table argument, which allows advanced HTTP requests
For delayed round restarts, Lua hook endround is called as soon as the countdown begins, not on actual round restart
Saying "rank" sometimes did not show proper values for players using Steam and U.S.G.N. logins
Lua command closeobjects sometimes didn't include objects at the edge of the given radius
Correctly drop key items (flag/bomb) when player disconnects from a dedicated server
It is no longer possible to include the "registered" symbol in player names
Bomb defusal MVPs are correctly assigned
Lua leave and disconnect hooks are now called for all players on mapchange
Lua leave hook is no longer called if join was never called (e.g. cancelled join or failed map transfer)
Lua leave hook is no longer called with ID 0 on dedicated server shutdown
Lua endround hook will never receive nil as the delay
Lua drop hook is now called before the leave hook
It is no longer possible for Terrorists to win after a CT win on Assassination mode
Treat ammoin parameters correctly for grenades when using spawnitem or setammo commands
Players now pick up only as many grenades from the floor as they need to get full ammo
Make sure hostages spawn with the rotation specified in the map editor
Maps with env_item entities edited to fall outside of acceptable item ranges no longer cause server crashes
Buildings spawned by env_building have their Lua object entity properties correctly set

Using reqhttp with the old function signature uses the old implementation, where the data argument to the httpdata hook will always be a string.

When making HTTPS requests, CS2D needs a certificate bundle. You can download one on the cURL website and save it to sys/core/cacert.pem to enable secure requests. A certificate bundle is planned to be shipped with future official releases.