I'd say your players shouldn't read chapter 12 of core EP (or any 'Game Information' chapters in the subsequent releases), as well as majority of chapter 8 (paragraphs about psi and the entry at the very end: "The Lost"). If you have EP core hack pack, you could prepare special censored version of the book for your players.

You can put some variations and secrets specifically for your game. In fact, some of the secrets are intentionally open to GM interpretations. Also, any of the in-character dialog side-bars are limited by the knowledge of the participants, so they could be wrong. Much of the information is rumored or known by a minority anyway, so even those who don't know about asyncs might know rumors. As a final note, Firewall has information about most x-threats and, while they may keep a lot of information need-to-know, they will probably give new agents a brief overview of x-threats (don't stick your ego in alien computers, avoid TITAN strobe-lights that hurt your brain, etc.)

Libertad wrote:

Aside from telling new players to not look at the Terminology entries altogether, is there any way to deter new gamers away from certain sections without revealing too much?

I sat down with my players and told them thus: "Look, I cannot stop you from reading the GM's section of the corebook, but I would rather you did not because you would spoil some parts of the plot I have in mind." It seems to have worked.

Ah, cutting the Gordian knot. A smart, simple and practical approach.

Well, the idea of making a censored version is good, but that won't stop a player from finding the complete book (that is something that happens even with campaigns, so there is no easy solution but to ask the players not to). As for other supplements, that will depend on the particular GM, but I'd say all of them (but for maybe Panopticon) include spoilers in one way or another, so I'd play safe and expugne all but the rule/gear chapters included in each one. So if the players want to see something, they can roll and you can answer, or you can copy/paste the info and send it to them using other media. A year or two ago, I ran a Deathwatch game (just 3-4 sessions, it becomes boring rather quickly when you only go into the field to kill stuff) with heavy computer support: we had the laptops with a private network and a shared folder, and I placed there the documents when it was time for it (player handouts, images of the stuff they were facing, etc...). And yes, it was quite unrealistic, since in Warhammer 40k dead-tree version of stuff is more common than the digital one, but for an EP game it can be great. Even better if you can use your laptop and a second screen facing the players instead, so they cannot look into other stuff during the game, by the way... XD