Five (5) new projects have been announced to be added to the P3D dapp ecosystem.
It was announced by Justo on P3D discord.

You don't count [ghost3d] project, because it's not P3D relevant dapp. It will be developed on TRON platform.

[0x]

WARNING: If you haven't solved the discord riddle and want to do it yourself - do not read further!!!

0x mentioned by Justo is the 0xCHAN project that is being developed by sumpunk with collaboration of not-yet-mentioned third party. It is confirmed to be ETHEREUM based and to be connected to P3D.
The redacted whitepaper with some hints can be found here after solving the discord riddle:
LINK TO REDACTED WHITEPAER

[v]

Project V will be another Ethereum based project. It is under development and no special informations have leaked. The [v] stands for very very important.

three unnamed projects

It is unknown what they are about but what I think is that they will come far later than the previous two mentioned. Most likely, after p3d site revamp.