buy now or wait?

i am considering buying this Olympus OM-D E-M5 but heard of the rumours that there will be a new OM-D that will come out. should i buy now or wait till a new OM-D comes out.

i know this is a vague question but i need some inputs.

thanks.

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eap_44
Nikon D7000
18-200 VR II
35 f/1.8
SB700