Well I don't know what it is, but one thing is sure: Meego Handset development and QA is being done almost exclusively under the iCDK and nCDK reference designs, which are both based on Medfield. You can find that info easily on any recent QA report for the Meego Handset weekly image.

N900 is still supported and there is development taking place, but I wouldn't bet on Meego debutting on an OMAP3 platform.