The plots for "Squidferatu" and "Slappy Days" have been revealed on ESB:
278a. "Squidferatu"
Squidward ventures to Nosferatu's castle after accidentally receiving his mail.
278b. "Slappy Days"
Nosferatu's minion Slappy kills some time around Bikini Bottom.
What's interesting is that both of these episodes involve Nosferatu, so these episodes may be releasing around Halloween.
278a. "Squidferatu"
Squidward ventures to Nosferatu's castle after accidentally receiving his mail.
278b. "Slappy Days"
Nosferatu's minion Slappy kills some time around Bikini Bottom.
What's interesting is that both of these episodes involve Nosferatu, so these episodes may be releasing around Halloween.