We don't know much more. Except "full XE technical and range will be announced later in 2014".
We know that it will get a new 2.0 Liter engine range called Ingenium. (probably the one that will be fitted to the base XF)
-There will be gas and diesel (Not for the US)
-The most powerful version will have a top speed of 186MPH.
-Global roll-out will begin from mid-2015.