This issue was announced by the USPS on December 13^th:

These stamps reveal life on Earth like many have never seen it. Twenty stamps feature 20 different images taken with microscopes and highly specialized photographic techniques that capture details of life undetectable by the human eye. The images show the phenomena of life in exquisitely fine detail. While stunning on their own as works of art, these images also hold scientific significance. Art director Derry Noyes designed the stamps using existing photographs.

We will post additional information as we get it below the line, with the most recent information at the top.

Updated September 5^th:
Here are the Scott catalogue numbers for this issue:
5802 Life Magnified pane of 20
a. (66¢) Red blood cells
b. (66¢) Macaw parrot feather
c. (66¢) Human hair
d. (66¢) Moss leaves
e. (66¢) Arranged diatoms
f. (66¢) Freshwater protozoans
g. (66¢) Acorn barnacle
h. (66¢) Moth antenna
i. (66¢) Diving beetle front foot
j. (66¢) Mouse brain neurons
k. (66¢) Starling bone tissue
l. (66¢) Moth wing scales
m. (66¢) Zebrafish
n. (66¢) Mushroom gills
o. (66¢) Freshwater snail tongue
p. (66¢) Blue button organism
q. (66¢) Mold spores
r. (66¢) Barnacle legs
s. (66¢) Flame lily pollen
t. (66¢) Oak leaf surface

Updated August 11^th:
APS’ Ken Martin speaks during the first-day ceremony:Updated July 11^th:
Here are the first-day postmarks for this issue:The Digital Color Postmark measures 2.73″ x 1.06″.The Pictorial Postmark measures 2.75″ x 1.08″