Considering how unwise it would be to hold off on a sequel to Dragon's Dogma for so long, I have to agree with you. And it's not like the OP's "leak" got any kind of confirmation anyway since it was posted.
...Why would it be unwise? Dragon's Dogma has sold 3.5 million after 5 years and being released four times (OG on 360/PS3; Dark Arisen on 360/PS3; Dark Arisen on Steam; Dark Arisen on Xbone/PS4). That's not much considering it took the largest team in Capcom history at the time to make the game http://www.eurogamer.net/articles/2012-03-20-dragons-dogma-can-sell-10-million-worldwide-reckons-capcom(For reference, RE 6 had 600 people at the time) and it's not much considering it's an open world game and how much it costs to make an open world game on PS4/Xbone.
There's also the fact that they've made and are maintaining Dragon's Dogma online and they are releasing Monster Hunter World in less than a months and I doubt they'd make two similar open world games (at least in the eyes of the market) at the exact same time (development on World started in mid 2014) while also having an online title in the same franchise.
I'd be really surprised if it was DD 2.