I made a change to an itinerary and the status of my requested (but as yet unconfirmed) upgrades changed from "Upgrade Requested" with the "up-arrow" graphic to "(R class requested)" The graphic is gone and now just the parenthetical is listed.

The mouse-over text changed from:

"Upgrade to United Business for this flight requested using a Global Premier Upgrade."

to

"You are confirmed in W class on this flight and have requested a change to R class. You will be automatically confirmed on this flight if space in your requested class (R) becomes available."

Why the difference (and most importantly, what impact on my upgrade)?