I don't imagine it will be and Rashid doesn't need Harry's help for that. Ask yourself why Jim made the choice to have LC be broken.
Does he need it, no, but it's more helpful that way for Rashid to be well out of the way of breaking any Laws.
"Hindsight," I murmured. "You mean he went to the future for this?"
"Well," Bob hedged. "That would break one of the Laws, so probably not. But he might have sent himself a message from there, or maybe gotten it from some kind of prognosticating spirit. He might even have developed some ability for that himself. Some wizards do."
Harry using Rashid as a messenger to give himself a message from the future works well. It also fits with his altercation in TC where Rashid says it isn't Harry's time to defy the WC yet. Yet being the operative word. If Rashid met future!Harry, say at the Outer Gates, he'd know something was going to go down along those lines. Harry couldn't risk telling Rashid too much, though, or he'd jeopardize his timeline.
With the attack on Arctis Tor, Little Chicago, and the Corner Hounds I'm wondering if there is going to be a time travel book where Harry is going to many different points in history, chasing someone else who's trying to mess things up.
Plot twist: There was Hellfire, but the one who nuked Mab's army was Dresden using Soulfire.
There's a book going to be dedicated to every Law, so we're in for some time travel for sure. My guess is that it'll be the last book before the BAT. That way, it can be used as a way to get Harry's eyes on all the important plot points that have been happening in the background of the other books. Dresden books have a pattern, and that pattern fractals out for the series as a whole. Introduce the problem (StF thru GP-ish), big mid-book fight (Changes thru CD), big aha mystery solved moment (time travel book), finale fight to fix it (BAT).
Going on that idea where the time travel book is the mystery reveal near the end, we can probably see clues of future!Harry in the background of several other case files (with plausible explanations of why it might not be time travel to throw us off the trail). My current list of candidates is:
- PG message to Rashid and PG more generally
- non-attributed "fuego" at Chichen Itza
- Little Chicago being fixed (possibly not by Harry himself, but asking an ally)
- PT cornerhounds