With wards being removed from the game, what will happen with sightstone?

Will sightstone become an essential item on all lanes or will it be removed/reworked? If it does get changed a lot, I see a huge Nerf in Lee Sin's kit. ( katarina also )

''For the second goal, we’re removing Stealth Wards from the shop so teams will need to rely more heavily on their pink (and blue trinket!)''

Does this also mean that the greater stealth totem(yellow trinket) is being removed?

If I seem lost, can someone explain to me what the heck is going on with Wards and Ward related items?