Here the link where you ca see all crypto and new crypto release
https://coinmarketcap.comThis is my reference site if where can i saw some new release altcoin..
This is the counmarketcap page that shows the newly released altcoins.
https://coinmarketcap.com/new/Look at the bottom of the page and it shows coins not mineable are indicated with this symbol *
Significantly premined coins are marked with these symbols **
The site doesn't give you their difficulty, however it gives links to block explorers which you could get the difficulty from.