The official site has released a selection of preview pictures from the first season Blu-Ray release of Star Trek: The Next Generation. Unfortunately, they are incredibly small (as seems to usually be the case with the initial pre-release images), but you can get a general idea of the improved color timing and effects shots:
Furthermore, Entertainment Weekly has released a (heavily compressed) clip from “Where No One Has Gone Before”. Click here to watch the clip at EW.com.
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