Meh, I think it's a work, or at least an attempted work on Hogan's part, in the hopes of stimulating some sort of interest in a Hogan vs. Austin match.
Whether Hogan is serious or he's just doing in as a means of keeping his name somewhat relevant, he says he wants one more match. Recently, he boasted that he's in good enough shape to even have a WWE WHC run. Hogan is well known for pulling stunts like this as a means of promoting himself. It's his art form, one he's pretty successful at because he always does or says something every few months to generate some buzz and keep people talking about him. Pro wrestlers are great at spouting bullshit and Hogan might be better at it than anybody, you can't take 90% of anything he says at face value.
It's all well and good but the big problem with the whole plan of Hogan having one final match is that he hasn't been cleared to wrestle. WWE has strict medical guidelines for talent, that goes especially for talent 45 or older that was implemented after Jerry Lawler had a heart attack in the middle of a match on Raw a few years back. When Hogan signed with WWE, he went through the battery of medical exams and whatever the results might have been, he wasn't cleared to wrestle. Not only that, but the results must've made management so concerned that they haven't had Hogan do anything remotely physical.