There seems to be quite a lot of hype for this.U2 was revealed just over a year after U1.
I am expecting some kind of ND game.
U3 was revealed just over a year after U2.
TLOU was revealed a month after U3.
U4 was revealed a year after TLOU (or half a year after TLOU if you count the map teaser).
TLOU2 was revealed under a year after U4.
We're right on time for a reveal of their next big game. Hopefully the multiplayer spinoff thing doesn't get in the way of that.