Mozilla has been teasing about the upcoming redesign of their popular Firefox browser for some time now. Originally going to be released towards the end of last year, it was pushed ahead for further development. During this time they have shared many renditions of what it will (or could) look like.
It seems they are pushing for more of a simplified Chrome-like interface that is packed with customization options so that you can really fit it to your needs. It will be a consistent design across devices (PCs, tablets, phones, etc) and various releases of the Firefox browser, with improved Firefox Sync support which syncs browsing data across all of your devices.
Currently it is digging its way towards Beta which is set to release in late March as long as all goes well. If the beta is successful, you will see the new update as soon as April 29th when Firefox 29 is released. If it doesn’t make it to Beta development in time, it will be pushed back one last time to Firefox 30 which will come out later in the year.