The greatest mystery in anime and manga, while I can't wait to find out, I enjoy the series as it is! All of the information I know is:
Its located at the End of the Grandline upon an island that no log pose can idenify thus the four red road Poneglyphs exist to point the location
It made Gol D Rodger and his crew laugh, thus naming the island Laugh tale instead of Rafttale
The world groverment fears it being found
It will trigger a war unlike any other, likely Pirates vs World Groverment and the Marines but instead of just one Pirate crew, it likely be lots of pirate crews
Its connected to Joy Boy, somehow
Whoever finds it can claim to be the Pirate King and the crew can be the Pirate King's crew, exactly how that works, is unknown at this point in time
Its connected to the Anicent Kingdom & the void century!
Oda is a great storyteller, he clearly plans things out well in advance, sure somethings have changed over time, but he is able to keep on top of power scaling while the other two of the big three got completely lost in their power scaling to the point that their writters had no clue how to deal with their overpowered villians outside of using cheep tricks or having them suddenly get swapped out for another villian to be the final boss! I expect when we learn the history of Joy Boy, it likely be tragic thou maybe also a fun adventure as Oden's story was, until it turned to the darkside as all major flashback arcs in this series do!
To liven the mood, a video that popped up on my recomendations eariler, blink's shake on Piano, a lively track for a lively show:
I'm currently watching Made in the Abyss, its a anime that's been on my to watch list but never thought about for quite sometime until just resently, only four eps in and its pretty good so far, thou I'm totally shipping the two leads!