JOEL - The concept of "eternal progression" implies that we will always be learning; otherwise how could we progress? This includes our pre-earth life, our earthly life, and the worlds to come.
We know that in the next life the gospel will be preached to the spirits in spirit prison (1 Pet. 3:19-20, D&C 138) ; which of course will require them to be able to acquire knowledge of the gospel so they can choose to accept or reject it.
Even after the resurrection it is believed that there is progression within what ever degree of glory we obtain; which implies further learning and expereince.
"The glory of God is intelligence, or, in other words, light and truth" (D&C 93:36) , and we will keep on obtaining more light and truth at least until we become all-knowing gods ourselves.

President Brigham Young taught:
"We are in the school and keep learning, and we do not expect to cease learning while we live on earth; and when we pass through the veil, we expect still to continue to learn and increase our fund of information. That may appear a strange idea to some; but it is for the plain and simple reason that we are not capacitated to receive all knowledge at once. We must therefore receive a little here and a little there. When we have lived millions of years in the presence of God and angels . . . shall we then cease learning? No, or eternity ceases." (Discourses of Brigham Young)

It's important however that we learn all we can while in this life:
"Whatever principle of intelligence we attain unto in this life, it will rise with us in the resurrection. And if a person gains more knowledge and intelligence in this life through his diligence and obedience than another, he will have so much the advantage in the world to come." (D&C 130:18-19)