Panasonic Lumix DMC LX3 replacement to be LX4 or LX5?

According to 4/3 Rumors, Panasonic will announce a successor to the wonderful Lumix LX3 this July. It is said to have the larger MicroFourThirds sensor, 3X zoom, and Leica style optical viewfinder.

However, there may by some difficulty keeping the lens small and fast since it will have to cover the larger sensor. The Leica 24mm f2 lens and it's close up ability is one of the best things about the Lumix LX3.

Here is a galley of LX3 photography: