I got this mail from a Chinese 43rumors reader (Thanks!):
“Jun GAO, a travel photographer in China, shared on his Weibo (twitter equiv. in China) today: A new Pen model from Olympus will be announced after Labor Day vacation (1st May). It looks quite good with all classic Pen elements. Technical spec will be superior to EM5 with seamless integration of WiFi control capability.
He also mention he will share his photo work with this new Pen camera right after the announcement.
Mr. Gao appears to be partner photographer of Olympus in China. He actively promoted EM5 and shared quite some travel photography work using EM5. Follow his tweets here http://www.weibo.com/jamesgao75#_rnd1365743777678.”