It's big news because its a harbinger of things to come (projected). For me, it's a big deal because of how dismissive many of the doubters have been about his ability to get back here. When someone pointed out the knee surgery, divorce, swing change etc, those were called excuses.
I have consistently argued that he could easily get 'back' and that his step off the pedestal was not a natural age-related decline, but an understandable consequence of the factors I just outlined. We are, as a society, far too willing to make a long-term determination on short term analysis. Therefore, I'm willing to say that his recent performance shows me that he can win multiple majors in the next year or two. I haven't felt that until his recent play.
And, I watch his play, not just the results. His game is back, at least right now. It could be gone tomorrow, but as the culmination of a 4 year process, I see a solid game that's similar to his dominant years.