"There she is!" said Corley.
At the corner of Hume Street a young woman was standing. She wore a blue dress and a white sailor hat. She stood on the curbstone, swinging a sunshade in one hand. Lenehan grew lively.
"Let's have a look at her, Corley," he said.
Corley glanced sideways at his friend and an unpleasant grin appeared on his face.
"Are you trying to get inside me?" he asked.
"Damn it!" said Lenehan boldly, "I don't want an introduction. All I want is to have a look at her. I'm not going to eat her."
"O... A look at her?" said Corley, more amiably. "Well... I'll tell you what. I'll go over and talk to her and you can pass by."
"Right!" said Lenehan.
Corley had already thrown one leg over the chains when Lenehan called out:
"And after? Where will we meet?"
"Half ten," answered Corley, bringing over his other leg.
"Corner of Merrion Street. We'll be coming back."
"Work it all right now," said Lenehan in farewell.
(James Joyce, Dubliners)
It seem that we’ll coming back is more probable and near than we’ll come back in the respect of the remark’s fulfillment. And we’ll be coming back relives the vagueness whether it implies future or continuous present, when he says we are coming back instead. Is this what the sentence meaning?