My thoughts on Dash's predictions.
10- Not sure I feel about a light-whip, but initially I'd say no thanks.
9- Ahsoka is done in Rebels IMO. I'm not sure that she is dead or alive, likely gravely injured, but I think she is off the board of characters in Rebels from here on out. One of the things Filoni mentioned was that even with limited screen time, she was overshadowing the main characters of the show.
8- Put me down for Ezra already choosing the dark side. I do see him taking the Maul path as more of a rogue than full on Sith though.
7- Kanan has already done the drunken Jedi thing (see A New Dawn). I don't know if they will go down that path again.
6- Inquisitors are doneskis. Look for a high ranking Imperial (higher than Kallus) being the main antagonist for next season. A secret apprentice for Vader seems unlikely. I think that one of the novels (forget which) makes it some what apparent that Vader is pretty loyal at this stage to Sidious.
5- Doubt it will be Tarkin as the main antagonist next season. They've also already alluded to the Death Star having been tested in this season's "Honorable Ones" with the wreckage around Geonosis. If any reference is going to be had this season to the Death Star, it will be about a super weapon that the rebels don't know of yet. Probably by way of Kallus.
4- I highly doubt that Yavin will appear in Rebels. A character from R1 sure, but not Yavin. Even after the events of ANH the rebellion wasn't cohesive. Ackbar's fleet had to come and help evacuate the Yavin base (mentioned in one of the comics I believe).
3- Rumors, yes I know don't put too much stock in it, strongly hint at Thrawn being the major antagonist next season for the show.
2 and 1 (since they are pretty much related)- A Maul and Kenobi showdown won't happen IMO. Maul has had his revenge against Kenobi when he killed Satine. His revenge is complete as Kenobi has to live with her death. I'm calling it now, but I think Maul dies at Ezra's hands.
Honorable mention: Yep, I am preparing for Filoni to reach to KOTOR for a character to pull into canon. Doubt it will be Revan though.
Honestly, about the only thing that I really want next season is Ezra to continue down the dark side path. A bonus would be Kanan Murdoch.