The deal seems to be done so that's quite an interesting move... Asking myself if it's got something to do with Hoeness wanting that Jupp stays or just a wish to see something else after the Buli.
In that case, it'll probably be more PL than PSG. I don't very see the point of say no to Bayern to take PSG. Plus he may have a too strong character for the players and the direction of PSG. Kind of stubborn. So it seems to be good news for Arsenal.
Having watched his 2 seasons with BvB, he is a very good manager, same group of Poch, Marcelino or maybe Jardim. Attached to his philosophy more than trophies and the 3 pts. Really like his search of perfection and way of playing: not just a poor possession copy of Pep.
He is also a good choice for a long-term paternship, could have probably stay a long time at dortmund if the club was more ambitious and receptive.
The perfect man to take back the new challenge of Arsenal. The "new" up front line is already there (do not remember his relation with Mhki and Auba) and with some changes in defence and midfield, they could actually looking again for the top 4, The last moves are not helpfull enough to look for more (Lacazette, Auba). Finally, he is a good tutor, could help some players improving in tactics and their abilities