This year, Bethesda is having their own conference at E3 to announce what they have coming up. They've been pretty mum on their next game overall, but that silence has finally been broken. Sort of. Bethesda's official Twitter account sent this out this morning:
Fallout 4? Fallout 4. While I was personally hoping for Elder Scrolls 6 first, Fallout 4 is an obviously acceptable announcement. I loved Fallout 3. I didn't play much of New Vegas, but I did enjoy what I played. Granted, this could totally NOT be Fallout 4. But let's be honest: it's Fallout 4. Let's hope for more announcements and teasers soon.