The question of what state Barry will be in after his return from the Speed Force, is but one of several surrounding The Flash, following the events of the season 3 finale.
The official Twitter account for The Flash production office has confirmed that filming is now underway on season 4, but has otherwise offered no clues as to how, exactly, Team Flash will go about freeing Barry from the Speed Force.
In the context of the series, the season 4 premiere title makes sense enough and presumably refers to Barry Allen’s (Grant Gustin) return from the Speed Force – the place that he wound up (willingly) trapped at the end of The Flash season 3 finale, following his defeat of Savitar aka.
The Flash returns to The CW on Tuesday, October 10th.