Volume 45 has been announced for release, so let's try for 46.

1.

• Will feature Aizen in his Hougyoku form
• Black text
• Titled "Deicide"

2.

• Will feature Isshin in Shinigami form
• Deep red text
• Titled "Edge of the Silence"

3.

• Will feature Aizen in his partly transformed form
• Blue text
• Titled "Back from Blind"

4.

• Will feature Isshin in Shinigami form with his *awesome* finger-flick pose
• Forest Green text
• Titled "The Death Trilogy Finale"

Not easy with this one; every other character that's appeared recently has already been featured.