The Imperial Fists have found themselves with an internal power struggle that has split the Legion. The Imperialists under the charge of Sigismund strive to defend the Emperor and Imperium they are sworn to protect against the Secessionist Imperial Fists under Alexis Pollux. See more the Dissent in the Ranks mini-campaign.
Liam recently did an army photo his Imperial Fists over on his blog , Ærgewinn definitely worth checking out if you get a chance!
There are a few more pics and close ups of the whole army view on his blog which you can check out clicking the link above. Instead I'll add a few pics of the army from elsewhere in his blog.
Veteran squad each with their own unique heraldry
The converted up Fellblade "Eldelweis" not sure why this didn't make it into the army pic but it is too awesome not to be shown off!
This is the first and hopefully not the last Army Showcase that we'll see for the Ultramar Secession. If you have a preference for which army you'd like to see next let me know and I'll see if I can't get a showcase done for it!