The PMDG manager Robert S. Randazzo gives some bits of news about their actual works. 777 development is still on its way, a bit slower than desired but planned for release near the end of year. The 777 printed manuals set will be ready in the next days with 10% off until the sim can be ordered from their download shop.
737 NGX future expansions will be available for purchase after the 777 because of the integration of improvements shared between both of them (like better hardware support).
There shouldn’t be 747-400 V2 preview before the 777 is out, although the team members have started working on it beside the other projects.
The DC-6 will enter the Beta tests soon and may be available this summer.