Originally Posted by RST
I'd say that batiks fall into the realm of contemporary. Solids and specific large scale prints are prevalent in modern. Contemporary is often traditional designs done in updated fabrics or colorways. Modern is more likely to be innovative or improvisational. Contemporary will go with stitch in a ditch or pantographs, and is more likely to be minimal. Modern is most likely to be straight line quilting or improv free motion, and fairly heavy.
I think you are being far too limiting in every case with such narrow parameters. For instance, modern traditionalism, the updating of classic quilt blocks and designs, is very often used by modern quilters. Two examples from the 2012 Boston Modern Quilt Guild show in Lowell, MA.
Dreaming in Color, by Jen Boucher (an Elizabeth Harman pattern)
Not Your Mother's Sampler, by Jane Fitzpatrick (a Laurie Smith pattern)
There is much overlap between modern and contemporary, and with good reason. Modern grew out of contemporary, to the extent that the main 'parents' of the modern movement, contemporary quilters/designers Denyse Schmidt and Weeks and Ringle, now call themselves modern, no longer contemporary.
The Modern Quilt Movement (and therefore the modern quilts produced) is intentionally very loosely defined. To do otherwise would limit the innovation, the improvisation, and the freedom of the design style...the very things at its heart.