If my underwater macros with the PEN2 are anything to go by, I would think that the PEN3 is as good or better for macro - with the kit lens. The picture I linked is of a 1cm large pygmy sea horse, and it is cropped. The resolution is amazing and I am sure you can easily fit two of them into the picture with a 3D lens without loosing sharpness or too much resolution. They are even selling some LED lights for macros. That should be great for on-the-go use.
In general I would say that the PEN models are very good cameras for all-round photography. You might want to take a look at the Lumix Lenses to get a bigger variety. I am very happy with the 20mm 1.7 prime lens for example.
Regarding Timelapse you might need to buy an intervalometer to control the camera. There are many models that let you shoot timelapses until the memory card is full and have tons of features. I am using this one here which does everything that I need.