(FT5) Olympus will launch a new 150-400mm f/4.5(???) in January

Two source confirmed that one of the lenses Olympus will announce with the E-M1X in January will be a 150-400mm with constant aperture.One source said the constant aperture is f/4.0 while another said it’s f/4.5.

I guess that one of the sources made a typo…can you please let me know which one it is? Thanks :)

Both sources confirmed there will be a 1.2x teleconverter too!