If the plants have only been in the ground about one year, it's normal for their berry production to be minimal at best; they need to establish a good root system first after transplanting, and mature more, in order to produce a more typical harvest size. It's typical for fruiting shrubs and trees to not produce much in the first 2 to 3 years in the ground; in fact, it helps to discourage fruiting in that establishment period by plucking off unripe fruits early in the season so the plant can divert those resources into growing more roots, foliage, and sturdier stems instead. (Don't worry about what already ripened and was harvested this year, it's fine.)

Leaf reddening in this case is a sign of stress (it's basically premature fall foliage color development), although it's hard to determine exactly what environmental conditions prompted it. Root stress is the most likely factor, and blueberries and their kin have roots sensitive to drought. In cultivation, they benefit from regular irrigation during dry weather spells. (We've been in a drought all year, for instance, which was particularly significant in the first half of the year.) Were the shrubs watered periodically between last fall and now? If not, we recommend monitoring them by feeling the soil about five inches deep next to the roots, watering thoroughly (at least a couple gallons per plant) once the soil feels somewhat dry to the touch at that depth. Recent rains that many areas have been getting are helping, but it's not uncommon for our fall weather to be droughty when no hurricane remnants have drifted up our way.

Have the shrubs been fertilized, or was the soil tested in this planting area? A laboratory soil test measures nutrient levels, organic matter content, and soil acidity level (pH), which can help you determine how to fertilize (what formulation and how much to apply) and if the soil pH could use adjusting, as blueberries require a fairly acidic soil to thrive. Soil pH influences nutrient availability to the roots, and it's possible for a soil to have plenty of nutrients that the plant can't access if the pH is too high. Blueberries also appreciate soils rich in organic matter, so if a test measured low levels, adding compost (when planting, or later, as a top-dressing about once a year) can help to boost that. Our Growing Blueberries in a Home Garden page has more info that may be useful.

Miri

Thank you for the quick reply and thorough information! Taking this as indication that hope is not lost and they can recover by following these measures. Thank you again.

You're welcome!
Yes, the shrubs look pretty good overall, just a bit stressed (we've certainly seen worse), so we think they'll be okay as they continue to establish.

Miri