Team A breaks the huddle with 11 players. A member of Team A runs from the team box onto the playing field with the intention of replacing the wide reciever on the opposite side of the field. As the WH is scanning the field ( probably recounting ) A's quarterback asks for and is granted a timeout. Any infraction ?

Not from me.

Same here, he didn't even need to call the TO imo, but once he is granted the timeout you can't call illegal substitution any how.

No foul, 2nd down

Why 2nd down? Down wasn't stated. :)

Definitely 2nd down.

Wouldn't be an infraction if the T.O. hadn't been called. The substitution becomes effective when the substitute, in this case, either communicates the substitution, takes a position in the formation, or participates in the play. Simply being the 12th player on the field in not a foul yet.
He could go all the way across the field to communicate with the player he is replacing. Then the replaced player must leave. All the way back across the field. All with no foul as long as the replaced is off before the snap.
A substitute also becomes a player when he enters the huddle.

3rd down!

Untimed down!

5th down!