I just read the title, and ABSOLUTLY NOT. There will be no new spartans, no Hasley, no anything! Let me say this for the 9th time in two months on this site.
The reason they cannot put the books into the games, is because many people have not read the books. This is a video game in case you didn't realize, not a book. You are supposed to waste hundreds of hours playing it and not learning anything, not reading a book. Back to the point though. Since many people have not read the books, this would cause confusion about what is goingon. this being said, bungie would fall. People would be angry and stop buying bungie games. Then gungie would be out of bisness. They are too smart for that.
Besides, where would they fit a Hasley or other Spartans? As far as we know, the story is this. Chief is on a ship, he crashes on earth and earth has been taken over by ovenant. Cortana is being held captive by gravemind. Chief finds that big builing underground. Now unless they are going to make that the place where the Spartan Project was put into effect(a lame plot), or where this Hasley is doing top secret research)much, much more lame), then there is no room for them.