If I understood correctly, releases will include native resolution and upscaled versions. Also, Laserdisc video is analogue format and so doesn't have an actual resolution to speak of, right? Still, given that TV and VHS captures are done at 768x576/640x480, there should be plenty of image detail to start with. Also, playback of a resampled file will always look better than upscaling since current interpolation filters are MUCH better than the (at best) bicubic we are accustomed too. Take a look at the following page in order to see the best interpolators in action:

http://www.general-cathexis.com/interpolation.html

Most of them don't look too good, but bear in mind all of them represent a 4x enlargement, which for a 720x480 video would mean a 2880x1920 result. A 1920x1080 result, which would represent a ~2.45x enlargement, might be able to get to look very nice if one of the better, feasible-for-realtime methods in that page was used.