Somebody @ Shueisha must have told him to cut the crap short and take a break to clear his head if he doesn't want to end up like Kubo who saw his final arc getting cut short all of a sudden.
Live look at what exactly happened at Shueisha:
Exec 1: "Ladies, hold your boners, it really happened: Togashi announced his return!!!!"
Exec 2: "Wtf man, what's up with his weird Twitter page, someone explain to the old man how to set up your social media account!"
Exec 3: "I'll do, no worries. Now to the important part: Guys, Oda just texted me that a new exciting Tama-backstory is coming up! Sumo guy and Udon prisoners will also play a major role in it!"
Exec 4: "Ok, that settles it! With the grandmaster now back, someone tell Oda to get his ass out of here, take a long break and actually think about the plot before he brings it to paper ..."