The only time Dick and Wonder Woman have spoken since the New 52 was in the current Titans book when she was there with Batman and Superman about asking him to fold the Titans into the JL and Dick was being pissy about it. I think that is the only time they have spoken. The only Green Lantern Dick has interacted with since the New 52 was Baz in that Grayson annual too I believe.
I think the idea of Dick having these deep connections or is the "heart" of the DCU are some of the biggest falsehoods in his fandom at the moment. They no longer exist and have't for a long time. It is a big reason why I'd like a solo book that puts him back into the DCU where he can't be isolated and can build up those relationships again. I've sort of become completely disenfranchised with that ever happening in a team book and I think his solo book will be the only place to really do it any justice.