I assume this should be in here as it certainly is a Rumour. I was bored tonight and though I would determine what size front element and filter is on those leaked Korean pictures.
Anyway. Here it is, I just thought I would stir the pot.
I assumed the camera is a GX-20. If anything the lens dimensions are an overestimate due to parallax, but not by much.
The final filter size is close enough to 67mm that it might be a FA rebrand, but its not a DA*55mm.
If you can't read the image too well the front element is 61.7mm dia. and the filter threads look like 68.5mm dia. (I would assume 67mm)