@Seraphem: It's still in early planning stages. I considered making it a oneshot, but I think tree chapters is most likely at this point (that may change though).
Of course, I have other ideas as well that are curently at a higher priority level. I'm still working on Star Swirl and Stripes Forever. Also coming up:
A Debt to the Stars: "The stars will aid in her escape." That was the agreement. But Nightmare Moon did not live up to her end of the bargain. Now, the ponies she raised have escaped from the stars and want vengeance. So they break out and raise another of Celestia's relatives. One who was hated by his relatives far beyond what Nightmare Moon ever was. Morning Star.
The Last Use of Antlers: It is the most important festival of the cervids, with the largest ceremony deep in Deerope attended by representatives of all races and competed in by members of cervid tribes from around the world. And this year, Star Swirl, Pinkie Pie and Rainbow Dash have been chosen to attend as representatives of Equestria.
A Talon in Diplomacy: Star Swirl has requested to be sent to the Gryphon Kingdom as part of a diplomatic entourage. But when tragedy strikes, it will take all her skill to prevent a diplomatic incident from escalating to catastrophic levels.
The Moulds of Opposition: One of Star Swirl's old enemies has allied with other enemies of Equestria. Their plan? To recruit six very special ponies and forge a set of artifacts with power rivalling that of the Elements of Harmony themselves. Should their plan succeed, they will have their revenge and Equestria will fall from it's height as a superpower in misery and chaos.
(I can't reveal who the vilians of The Moulds of Opposition are because SPOILAZ! (No, seriously MAJOR spoilers.))
I'll concur that Sereg is awesome, but what does his dislike of Life & Times have to do with it? -
Midnight Rambler