Who does new Soraka lane well with
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Any poke/disengage lane partner. Just trade, disengage, heal, poke, trade, disengage, heal. Annoying in lane, but you might not out-right dominate. So I'd say
(but who plays that champ amiright?) and possibly 
Short range adcs who dont need a lot of peel. Basically soraka is at her best when her adc makes a lot of short engages. Not hard engages, but skirmishes. Champs like graves, lucian, and maybe vayne. Adcs who are too safe never need you, while adcs who are super risky need better peel.
Honestly I think Soraka synergizes well with pretty much any ADC, it's more about who she is up against. She doesn't do well against all in supports like Thresh or Leona, but in extended trades and skirmishes she wrecks face.
I persnoally find her extremly strong with
, just max E as MF and the combo of the strong aoe slow(with very high basedamage) and soras aoe-silence ensures the root from soras E if used well, whichh then can be used to land a full mf-Ult.
Overall, Sora works well with all carrys that have movment imparing abillitys to help landing the root(sora graves also is nice, keep em in the dark with his W+ur E, while your heals are even more effecktive thx to his passive defstats)