It looks like Hotline Miami 2: Wrong Number is coming out March 10.
+1 (786) 519-3708 ext 10
— Hotline Miami (@HotlineMiami) February 2, 2015
The above tweet was put out on the Hotline Miami Twitter account. Ringing the number gets you a garbled message, which says March. Add on the ext 10 and you get the date. Listen for yourself below.
Hotline Miami 2: Wrong Number will be out on PS4, PS3, Vita and PC.