"Leaf roll, or leaf curl, is a physiologic distortion that may develop with periods of cool, rainy weather. It cause the lower leaves to roll upward and become thick and leathery. Leaf roll does not affect plant growth or fruit production and requires no treatment.
Leaf Roll
Herbicides can distort the foliage and fruit of tomatoes. They are especially sensitive to 2,4-D. Damage can bend the leaves down, causing cupping and thickening. New leaves are narrow and twisted and do not fully expand. Fruit may be catfaced and fail to ripen. Exposure can occur when herbicides are applied to lawns for weed control and the spray "drifts". Resultant fumes can also effect the plants for several days after treatment. Clippings from grass that has been sprayed with a herbicide should not be used as mulch in the vegetable garden. If the exposure is minimal, the plant will outgrow the injury. Be sure to water the affected plants thoroughly and often."*
* http://www.coopext.colostate.edu/4dmg/Pests/Diseases/tomaprob.htm
Hopefully, What I am seeing is the top case, although the later isn't impossible.
This also seems to following the same line, so my current thinking is environmental stress. Which is not surprising.
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