Few sources can be useful for tracking current DeFi projects:
defimarketcap.io shows total capitalization for each token;
defipulse.com shows total locked value for each token;
defiscore.io shows risks for each defi token;
dappradar.com different data related to decentralized apps;
defiprime.com shows ROI and % for loans/lending for each token.
More related to your question about upcoming DeFi projects:
https://cointelegraph.com/tags/altcoin use this section to track main DeFi news. Sometimes here appears information about upcoming DeFi projects.
https://cryptonews.com/ also a lot of useful news
There is still no created an DeFi-based news source. Due to DeFi uncertainty it's impossible in current conditions and exactly have no sense. I offer you to follow some reddit boards. DeFi is like venture investment - 1 from 10 project will boom but remind that all of 10 can be shit.