As promised, armycalc have been updated with the new online editor.
You can see an example here: sandbox.
For now it have been tested under firefox 3.5 and newest safari browsers.

As this is a testing version, old editor is still available as usual.
You can use both perpendicular. All data is stored separately.
Rulesets have been manually converted to new format.
Example Ruleset have been updated to show editor features.

List of features of the new editor:

• units images.
• bonuses can have their own characteristics. Things like units champions or mounts can be easy implemented now.
• validation on the fly. As you are editing an army the bottom panel will be updated with warnings and errors.
• saving armies without reloading page.
• changing army size limit while editing.
• better organization of add-ons groups.
• units list can be reordered using 'drag and drop' method.
• foldable menu with available units.
• it is a lot nicer than the previous one

Also new 'My Armies' section is available that works with new editor. This is a really cool and usable thing:

• You can create folders to group your armies as you like.
• Folders and armies tree can be modified using drag and drop interface. Use Your left mouse button to move armies from one place to another.
• Use right mouse button to access content menu from which you can delete/rename armies/folders, download armies in different formats, etc.
• Your tree is saved automatic each time you make a change. No need to reload page.

Both elements allow to download an army as a *.twa file.
You will be able to read this file in future version of ACE which is under development at the moment.