Specialist Mages (Not wild mage)
The other day I was browsing the internet, (Shocker eh?) and came across a thread somewhere that mentioned specialist mages have I think +1 to rolls for their school and opponents have -1 when specialist casts said school on them... Is this A) true and if so
how does that apply to a Conjurer, as they primarily summon creatures to do thy bidding?

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They do however have a 15% higher chance of learning a spell from their school and a 15% lower chance of learning a spell outside of their school. So if you have a 75% chance of learning a spell according to your character page then you'd have a 90% chance of learning a conjuration spell, but only a 60% chance of learning a non-conjuration spell.
Edited: Edited because I wrote this prior to learning the truth (and also prior to becoming a "developer")
@elminster is right: According to the official Facebook message from February, 6 (https://www.facebook.com/BaldursGateEnhanced) "Specialist mages in BG:EE and BGII:EE receive a +2 bonus on all saving throws against spells of their chosen school. They also get a 15% bonus to their chance to learn spells from their chosen school, and a 15% penalty to their chance to learn spells from any other school."
http://forum.baldursgate.com/discussion/comment/466203/#Comment_466203