At least here in the Northern Hemisphere, the Shadowseer definitely saw its shadow, since we've definitely got more winter coming.
Source
From the post:
Illusion, misdirection and terror are the psychic tools at the disposal of the Shadowseer. Wherever the Shadowseer treads on the battlefield discipline collapses, replaced by a bedlam of screams, gibbering and panicked, aimless gunfire. Through it all strides the Shadowseer – an island of sinister calm in an ocean of madness.
This 11-piece plastic kit makes one Harlequin Shadowseer armed a shuriken pistol, miststave and hallucinogen grenade launcher. The shuriken pistol can be replaced with a neuro disruptor which is also included. The model is supplied with a 25mm round base.
Embracing the role of Death in its entirety, there is no mercy in the heart of a Death Jester. His outsize shuriken cannon reaps a deadly toll on his enemies as each round, impregnated with virulent biotoxins, causes its victims’ metabolisms to spectacularly detonate.
This 10-piece plastic kit makes one Harlequin Death Jester armed with a shrieker cannon, and has a choice of 2 face masks. The model is supplied with a 25mm round base.