N9 was not "proper" MeeGo, internally it was still mostly Maemo Harmattan, followup to N900, though they had few canceled hardware projects between N9 and N900. MeeGo was suppposed to be co-developed with Intel, but it was never going to go anywhere, because neither Nokia or Intel had no idea what they were doing. Nokia wasn't built to be a software company and Intel has given up on x86 in phones.
Only reason why N9 ever was released is because they simply brutally cut down the scope of the project, e.g. dropping Qualcomm-based variant for US/CDMA markets (that one was repurposed to be their first Windows Phone).