My Leman Russ Punisher tanks and Chimera APCs, probably will go. All my infantry, like Company Commander, Command Squad and Veterans will go. I'll probably sell my Skitarii and Adeptus Mechanicus army, probably just keep the Tech-priest Dominus and my Vanguard, and even Rangers, but everyone will go. Hmm, I might keep my Onager Dunecrawlers, but I'll have to get rid of the Ironstrider Ballistarii, Sicarian Infiltrators, Sicarian Ruststalkers, Kataphron Destroyers and Kastelan robots. They don't fit inside my list anymore, not when there's no more War Convocation.
The only models I'll keep for sure are my Imperial Knights, my Leman Russ Battle Tank, Tech-priest Enginseers, my Leman Russ Executioners and my Storrmtroopers. I'll be getting the Forge World book for Astra Militarum forces, so I'll keep my Vendetta gunships for now to see if I can still field my Kamikaze Troopers. Since they're there, I'll keep the Taurox Primes but I don't think I'll ever use them. I might actually sell my Knight Warden, but we'll see. I'll definitely keep my Banesword, I'll be converting it into a Banesword.
If I sell them off, I'll have to buy 2 new Baneblades (I'll be using the Shadowsword and Banesword variants), and a new squad of stormtroopers.
So basically my Kamikaze Troopers are my new Skitarii. According to my fluff, anyway. Instead of using Skitarii Vanguard and rad carbines, the Kamikaze Troopers are augmented soldiers with hot-shot lasguns and hot-shot volley guns, and in many cases, plasma guns.
So basically I have an Imperial Knight super-heavy Detachment and a Militarum Tempestus Battalion Detachment.