I'm getting this last arc vibe too. But i think Amano delivered it...from the start we have seen Reborn pushing Tsuna to get stronger so that he can become the true 10th, and i think he is already there and Reborn knows that, especially after the feat of making everyone fight together against the Vindice. So , for me, the main objective of the story is ready to be fulfilled in a really good way. I am satisfied with it.
As for next chapter I don't think Tsuna will be able to defeat Jager by himself, so we might see Reborn joining this fight too.