From what Dinopawz (senior writer) said. I doubt that Urgot would be spearhead of Noxus relaunch
In respond to why there is no Lucian, Sona or Xin story included in this Demacia event. Dinopawz explained the reason behind this decision.
"Trust me, we didn't want to leave them out, but we felt we'd be better served in these stories (intended to properly establish the culture of Demacia) with champs who more intrinsically represented the character of that realm. We'll get to them eventually, but for the initial impact, we wanted to focus solely on the champs that are inherently Demacian." ref: http://www.surrenderat20.net/2017/03/red-post-collection-god-fist-lee-sin.html
This means they really care so much about choosing candidates who can execute a faction's "initial impact". That's why I doubt that we will see Noxus lore relaunch coming with Urgot's rework this mid year. We all know that
is Noxian but he has strong ties with Zaun. This's not just my idea even Reav3 ever stated about this as follows.
"We also didn't want to do 2 back to back Zaun champions(While Urgot is technically Noxian, he has strong ties with Zaun)." ref: http://na.leagueoflegends.com/en/news/champions-skins/champion-update/state-champion-update
I know it sounds monotonous but let me repeat this again that
is the perfect one who can do this job. Considering from Dinopawz's criteria, Swain is inherently Noxian. His grand general position makes him a perfect representative of this faction which values strength in any form. Moreover, He is high on VGUs list. Only thing they need to do is solving his identity and gameplay which I'm very sure they have discussed about it a lot.