With the official CBS announcement
All 178 episodes from seven seasons will be transferred to true high-definition 1080p for release on Blu-ray and eventual runs on television and digital platforms both domestically and internationally.
in the next 4 years I think we can safely put this thread to sleep. No mention of a Blu-ray 3D release or conversion of TNG in the above official press release so it is not happening.
also from the TNG subforum
The OFFICIAL STNG-R general discussion thread!