To wait, or not to wait - Oly OM-D or ??

When considering:

http://www.43rumors.com/ft4-new-olympus-mft-and-fast-zoom-on-sale-in-spring-no-cp-announcement/

and the need to reorganize my photographic wares - i'm looking for some opinions on plunking down on the  (already one year old) OM-D or wait 6 more months for whatever comes next?

Also, anyone using the new Panasonic GH3?  Is that even better than the OM?

Also, how on earth can these guys compare when stacked against this:

http://www.costco.com/Nikon-D600-Full-Frame-DSLR-Camera-2-Lens-Bundle.product.100012382.html

GAW - so confusing.  Thoughts?