Gen2 Pokemon that Evolve from Gen1

To my knowledge, nothing official has been announced. I did find this article which makes assumptions of what you are asking about if you want to start prepping now.

https://rankedboost.com/pokemon-go/generation-2-release/

1) Yes, here ist the link: www.google.com
2) We do not know, but it is assumed from Slowking.

• Crobat from Golbat
• Steelix from Onix
• Blissey from Chansey
• Politoed from Poliwhirl
• Bellossom from Gloom
• Slowking from Slowpoke
• Espeon from Eevee
• Umbreon from Eevee
• Scizor from Scyther
• Kingdra from Seadra
• Porygon2 from Porygon
  I have listen that pokestops will provide the special objects for the evolutions-by-objects, so I think Slowking will correctly evolve from Slowpoke.
  Additionally, its interesting to save some Pikachu, Clefairy, Jiggly, Electabuzz, Jynx and the two Hitmons to make eggs for preevolutions, with the special case of the Hitmons cause his pre-ev has a new posibble evolution, Hitmontop