After a conversation with Lance Shaner, Owner of Omega yeast, the following was added to the FAQ section of their website:
My pack of yeast is swollen. Is the yeast still good to use?
Swelling of the pack is not an indication of a problem with the yeast. It is the result of slow fermentation of residual fermentables during storage. The yeast is still perfectly fine to use (assuming it is within date and has been stored properly)
OYL052. A strong fermenter popularly referred to as “Conan.” Its peach, apricot and pineapple notes are steroids for hops, complementing modern fruity hop profiles in particular. A diacetyl rest is suggested if fermented in the lower temperature range. Many brewers enjoy blending DIPA with British V (OYL-011) for enhanced haze and complex, fruity ester profile.
65–72° F (18–22° C)