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I'm kinda interested in how everyone determines their psychic disciplines, during Army Selection or before deployment?

The BRB says that you do it before deployment, and that you choose a discipline and then roll the power - then repeat until all your powers are determined. This means that you don't have to commit to discipline pre-game - and if you roll up your intended power on your roll, you could change your mind to a different discipline on the spot.

I'm just wondering how your metagroup plays it, as every tourney I've been to requires you to stipulate which disciplines (and how many powers in each) on your army list.

It may be different in a tourney but for normal games I would say before deployment as per the rulebook.

The tournys I was in right after 6th required you to choose who was trading for powers and what tables before your first deployment and you kept that all day. At some point (don't remember when) they changed it to follow the rulebook of doing it when deciding warlord traits.

If you have psychic powers which are specified, as opposed to randomly rolled for, in your codex (such as the current Space Marine, and Tyranid codices), those are selected as part of your army list creation.

However, as denoted in the rulebook psychic rules, before deployment for each game, and right after rolling for warlord traits, you can choose for each psyker (if that psyker has the option; see your FAQ) to swap all of his powers (exception: Grey Knights have to keep Hammerhand) for rolls on the charts allowable to that psyker. This is done at the beginning of each game.

For psykers who have no access to "fixed" powers in their codex, you always roll randomly after determining Warlord traits just before deployment.