I got this from one trusted source and I hope to double confirm it soon (including exact announcement hour). The source said the RX100M3 will be announced on Thursday May 15. Specs have been confirmed by multiple sources and here they are again in case you missed to read them:
20MP sensor (same as RX100M2 model)
24-70mm f/1.8-2.8 lens
Built in View finder (SVGA OLED Tru-Finder 1440k dots)
Tiltable screen (180 degrees up)
Record in XAVC S format (Same format of the Sony A7s but with no 4K output option).
Almost same size and weight as the current RX100/M2 models.
I have been told all other specs are the same of the current RX100II model.
Price is said to be around 800-850 Euro in Europe. Should be around $800-850 in USA (US price is my guess)
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Reminder (SR = Sonyrumor):
SR1=probably fake rumor
SR2=rumor from unknown sources
SR3=50% chance it is correct
SR4=rumor from known sources
SR5=almost certainly correct!