New Compose Mode
Mailplane supports Gmail's new compose mode. Mailplane does always compose a message in a new window. We think it is superior to Gmail's inline window.
Preview Pane support
Mailplane supports Preview pane. It's a Gmail lab feature (Gmail Settings > Labs) to read mail right next to your list of conversations.
Ask for download location
Mailplane has a new 'Always ask me' option inside the 'Save attachments to' menu (Mailplane 3 > Preferences… > General). It asks for the download location after each download.
* 'g' button don't makes an 'error beep' anymore (e.g. g+i shortcut)
* Improved attachment preview (via QuickLook)
* Context menu item 'Download linked file' does now work
* Contact export (e.g. CSV) does now work