The screenshots have been updated to showcase the new graphics mode introduced near the end of development, called "Original+FX". This optional mode adds transparency effects and other visual enhancements that were not possible on the original NES, while players can still choose to enjoy the authentic original graphics mode.
Several new languages have also been added, including Simplified Chinese and Japanese. If I can find more translators, Additional language support may be added before launch or in future updates as more translations become available.
Finally, a brand-new trailer has been released to celebrate the launch date announcement, featuring footage from brand-new areas that have never been shown before.