I didn't see anyone else mention it. I'm currently trawling through the SM section to see what's "No longer Available" i.e. likely to be turned to finecast and what's simply disappeared. Just from my own perspective, i think this is the first signs of them starting to move all metals over to finecast, including less popular items that were always mail order only.
Confirmed as finecast by WD
Legion of the Damned Squad
Damned Legionnaire with Multi-Melta
Damned Legionnaire with Heavy Flamer
(It should be pointed out that while these show as "No longer available" as expected, all the blisters of two legionnaires, and the other sarge show as available, although there is no longer a Damned Legionnaires 2 Pack, just 1,3 and 4.) Many of the ones still available are shown on the facing page in WD.
Disappeared (See anymore please post and i'll add to the list as this is harder for me to spot cause they've gone)
Iron Hands Tactical Squad rumoured to become finecast upgrade
"No Longer Available"
Marneus Calgar (in power armour)
Chapter Masters box set (all available individually except Master of Fleet, strange)
Chaplain in Terminator Armour
Chaplain with Crozius and Power Fist
Librarian with Staff and Book
Librarian with Sword and Bolt Pistol
Space Marine Apothecary (1)
Veterans MK1 and 2 (all available seperately except Lightning Claws 1 and 2)
Tyrannic War Veterans 1 and 2
Dark Angel Deathwing Terminator
Dark Angel Deathwing Terminator Sergeant
Notably still available (where not mentioned above)
Space Marine Casualties as they're shown on the facing WD page, which shows a battle between Orks and LOTD and Tigurius with tactical marines. (i.e. all the stuff they'd just said was gonna be finecast)
3 Pack of marine bikes, rumoured to become an upgrade pack for the metal parts