From the solicitation:

The new volume of the Eisner Award-winning MOUSE GUARD series continues! Celanawe, honor bound by his loyalty to his Guard Matriarch, accompanies Em, his only living relative to Port Sumac. There they find a mouse just brave or crazy enough to take them across the sea and beyond the record of any map. This long sea voyage gives Em the time to explain to Celanawe about her instance for the journey and how their fates will forever be tied to the Black Axe.

Preview Pages:

MOUSE GUARD: THE BLACK AXE #2 (OF 6)
Retail Price: $3.50 U.S.
Page Count: 24 pages
Format: saddle bound, 8” x 8”, full color
On-sale Date: May 4, 2021
Written by David Petersen
Illustrated by David Petersen
Cover by David Petersen

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4. Archaia Going to 3rd Printing of Mouse Guard: Fall 1152
5. Mouse Guard Creator David Petersen to Sign at Comic Bug