There are a lot of rumors about new Imperial Knights, and even re-directs (which have been removed now) have shown Imperial Knight releases coming in the near future. Two new models, a Warden and Crusader are coming, and this rumor points to them with some new updates and formations coming.
Please remember that these are rumors.
via Bird in the Trees on Bols
Both Knights are coming via a combined combo kit.
Plastic kit will be released in the short-term, but the exact week is unknown.
The Warden & Crusader will share White Dwarf only rules initially, with inclusion in a codex coming later.
The new designs do not share the “turtle shell” carapace, and have a divergent appearance.
Both models share an up-armored, brutal appearance compared to the Paladin/Errant model.
Both share three weapon hardpoints, 2 arms and a top carapace mount.
Both new Knights share a Heavy Support position in a Imperial Knights army list.
Expect an Imperial Knights “Decurion” formation to be arriving with the new kits.