Chapter 478 of "Fairy Tail" is now online through Manga Park. The current chapter continues the story of Jacob Lessio's attack in the Wizard Guild Hall with Natsu finally waking up to fight him and protect everyone.
The current chapter is titled "Stealth" indicating the magic of the Spriggan 12 member attacking the Wizard Guild Hall. Before any predictions and speculations of the upcoming chapters, here's a brief recap.
Natsu and Jacob Lessio square off with Natsu immediately attacking the Spriggan 12 member. However, Jacob Lessio has the upper hand because of his ability to vanish into thin air and reappear as he wish without any detection.
He promised "living hell" to his opponents but it somehow backfired. Jacob stripped Lucy to her undergarments but Natsu didn't feel uneasy because he often sees Lucy in a skimpy dress. However, Jacob was closing his eyes because he doesn't want to see anything revealing.
Lucy and Natsu took advantage of his weakness for an attack. The chapter ends with Mavis declaring she finally knows how to defeat Zeref.
The upcoming chapter is titled "What Should We Show the Greatest Respect Is..." provides a clue on what's coming next: August. In the previous chapter, Jacob indicated that August is also coming and he wants to show respect but removing everyone in their path. Jacob is mostly likely meeting his end in the next chapter as he is unable to deal with the "revealing" people in the guild.
Reddit user Poke-Pro somasora7 predicts that the combined power of Natsu and Lucy will finally end Jason in the upcoming chapter. User Code of Manga Helpers also has a separate prediction for the upcoming chapter which will reveal Spriggan 12's tactic in getting to the Wizard Guild Hall without detection, "...stealth could refer to the fact that Jacob is an assassin, or to the fact that August was able to undermine the map that detected where the Spriggan 12 were. I do think that it will involve someone sneaking around (no surprise there), I think that whoever is doing the sneaking (if anyone is) will be a Fairy Tail member, or at least one of the good guys (hence the peaceful non-violent cover). August might join the fray later, although probably not in this chapter."