The following is a summary of the releases of Roll20 updates, along with a link to the forum post/full changelog for each.

August 6, 2013

• Introduced Status Effect Icons, over 50 icons to use to keep track of status effects and other information about your tokens
• Introduced Roll Queries, a way to gather information to use in a roll or macro on a per-use basis
• New token display settings to determine where (top, bottom, etc.) status effect markers should be shown, and customize the color of token bars for your Campaign
• A new Deal to Initiative feature, very useful for games such as Savage Worlds which use card-based drawing to determine turn order. Matching new turn order sorting option to sort by card/suit.
• Inline roll highlighting of crits/fumbles
• Shadows for 3D Dice
• New improvements to communication on the site, including PM archiving and editing and a Dismiss All Notifications button

Full Changelog

July 16, 2013

• Introduced the Transmogrifier, a tool to help GMs share resources between their campaigns
• Introduced Inline Rolls, a new roll tool which has more compact results and can be used to do "sub-rolls" inside of other rolls
• Added floor() and ceil() functions for use in rolls
• Fixed crashes relating to the 3D Dice system
• Enabled Rollable Tables for ALL users (including Base/Free accounts)
• Added chat history clearing options

Full Changelog

June 25, 2013

• Usability improvements to the Character editor, tokens, macro quick bar, etc.
• Group rotation and scaling added
• WebRTC trial underway to test new video chat implementation

Full Changelog

June 6, 2013

• Small update focused primarily on improving lost connection detection

Full Changelog

June 4, 2013

• Modules (collections of maps, tokens, sounds, characters, and handouts which are pre-generated and made into a Roll20 Campaign) were introduced. One free and one paid module were available at launch.
• The Roll20 API was enabled on the Main Server for Mentor users.

Full Changelog

May 14, 2013

• Card decks were improved, with additional options for how cards are played to the tabletop, new hand management display, and a discard pile.
• The API was further improved, including state object persistence between play sessions and the ability to create new objects

Full Changelog

April 30, 3013

• The Roll20 API was introduced
• The Roll20 Wiki was unveiled.
• New features for the Journal including tagging + searching journal entries, drag and drop re-reordering of attributes and abilities, players can edit Handouts, and more.
• Custom turn order entries
• Hide the right sidebar
• Macro and abilities editor made easier to use

April 8, 2013

• New Chat features including commands and avatars
• Auras now appear under tokens
• Weighting of Rollable Tables now possible

[1]

March 13, 2013

• Rollable Tables and Dice Tokens now available, allowing customization and "physical" use of dice
• Z-Order and Rendering Improvements

[2]

January 28, 2013

• Complete Overhaul of the Roll20 Forums
• Campaign Forums
• Private Messaging

[3]

2012 Updates

For a list of updates that occurred prior to 2013, please see the following forum post.

[4]

Full Changelog