I got feedback from trusted sources. They confirm everything what the new Japanese source told to Fujirumors and… now here is what we know:
DATE: On June 25 Fujifilm will indeed make an important announcement.
X-BODY: The question is, which X-camera will be launched first (the X-Trans or the non X-Trans body)? According to both, the Japanese and trusted sources Fuji will launch the “little sister” (X-M1?) of the seXy-one (X-E1). It will be a cheaper and smaller X-E1 without viewfinder (trusted sources) but with tilt screen (new sources).
LENSES: According to trusted sources, on June 25 Fujifilm will launch the 27mm lens (confirming this FR-post of April 15) and the new zoom lens. Trusted sources said it will be a 16-50 or 16-55 cheap zoom lens. The new Japanese source told me that it will be a 16-50 zoom lens (if the source is right also this time, I think I should upgrade it to “trusted source” :) .)
FIRMWARE: Fuji will update the firmware for the X-E1 and X-PRO1. With these new lenses in the pipeline, it’s possible that it will only add compatibility. If I remember well, Fujifilm talked of a major firmware update in July.