What is 4K? Next-generation resolution explained
Conclusion
Will the extra resolution offered by 4K make movies better? You could argue that it depends on the format of the original film. For example, "The Blair Witch Project" and "28 Days Later" were both shot with standard-definition camcorders, and there would arguably be little extra benefit to buying either movie in a 4K native format over a DVD--depending on the quality of the scaler in your brand-new 4K screen, of course.
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Even with reference-quality native 4K material, however, a 4K-resolution TV or projector won't provide nearly the visible improvement over a standard 1080p model that going from standard-def to high-def did. To appreciate it you'll have to have sit quite close to a large screen--sort of like being in the front few rows of a movie theater.
But whether it's 4K or 8K, you can bet that manufacturers haven't run out of cards when it comes to trying out the next "must-have" feature in the coming crops of televisions.