As it was foreseen, the animated Star Wars Rebels series will come to an end with its fourth season on March 5, 2018. On that evening the penultimate episode "A Fool's Hope" will air at 8:30pm, followed by the two-episode length series finale "Family Reunion and Farewell" debut at 9:00pm.
It looks like the series will end where it started, the home planet for main character Ezra Bridger (Taylor Gray), Lothal. Here's how Zap2It describes the upcoming episodes:
A Fool's Hope Season 4, Episode 14 Airing Mar 05, 2018 TV-Y7 NEW CC
Ezra calls in every favor he can to rally together a ragtag group for a seemingly impossible fight against Governor Pryce and her Imperial forces.
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Family Reunion and Farewell Season 4, Episode 15 Airing Mar 05, 2018 TV-Y7 FINALE CC
Ezra's team takes drastic action to free Lothal, entering Imperial HQ, and Thrawn returns to stop them; Ezra must surrender and confront a greater evil.
A trailer for the final episodes has also been released with its own description:
Prepare yourself for the epic series finale of Star Wars Rebels! It all starts Monday, March 5th at 8:30P on Disney XD. The Ghost crew joins the growing Rebel Alliance, struggling to unite against the Galactic Empire. However, when a new Imperial threat arises on Lothal, Ezra leads the crew back to his home world to defeat the oppressive forces of the Empire, under the command of the cunning Grand Admiral Thrawn. Old friends are reunited and new allegiances are forged as the series builds to its epic conclusion.
Good luck Rebels, you're going to need it.