I think he'll call it a career. However, reports out of NY are that his teammates want him back. They feel like they could be great if they had a full training camp with him. If he is healthy, give it a go old man. When he was healthy this year, he looked like Favre. It is when he got hurt towards the end that he really looked terrible.
I heard he might want to get it scoped out but ESPN was saying it wasn't anything too major. If he wanted to he could still continue his career; at what level though I'm not sure.