From what I have read, Poppinga was in good spirits through his rehab. And apparently he is also ahead of schedule (can't remember where I read that). Poppinga was also anticipating getting back to playing football next season.
As for Walker, I guess no news is good news. He has been back home in Texas rehabbing, and has kept a really low profile, excluding him firing Rosenjerk. I tried to find something to give a little insight on Walker, and have found nothing directly about Walkers situation. Only this little blurb, which paints a bright picture.
As the Packers new WR's coach, Jimmy Robinson, said "But history has shown players come back just fine from that (what Walker suffered)." So Walker and fans have every reason to be optimistic!