Gosselin will indeed probably be the move. It probably couldn't be announced tonight, because the 10 days may not be officially up until tomorrow. Otherwise no reason not to go ahead and announce it.
Gosselin has logged some time in LF throughout his minor league career. They've moved him around a lot this year (most of his time in the field at 3B, followed by 2B, SS, and LF). There was speculation when he was drafted that he would end up in LF, but up until this year his bat wouldn't carry at that position. My guess is they will use him similarly to the way he was used in Gwinnett when he's in the field. Pinch-hitting is probably going to be his #1 duty.