Exactly, that's how most funds work.
It will invest in current assets and projects as well as in upcoming projects. That's why 20% are unallocated.
You may ask now: why not directly invest in these assets (without BCapital)?
At first, I diversify my portfolio. See the spreadsheet in the OP for details.
If one assets stops paying out that is not a tragedy. The other assets will absorb the loss. Of course they won't catch up everything but you won't have a 100% loss though.
The other side is that 8% are going to the BURST ecosystem.
This will be used for various promotional projects like marketing, banners, signatures etc.
To sum up, I can say that you are still receiving the dividends from the assets while helping the BURST system becoming bigger. I think that's a pretty good deal. You get dividends and with 8% we are helping BURST becoming much more popular.
Edit: Thanks @ the first buyer :)