The 314 is a more direct (almost identical) copy of the light-weight Majestic "CoolBase" material.
The 312 is the thicker, cheaper traditional polyester material.
When I played LL Seniors (28 years ago) while also playing High School, I remember having to have a set of cleats for LL (plastic/rubber)and metal spikes for High School. Do they allow spikes in Senior/Big League now? (I only work High School).
Having just acquired a lightly used Force3 V3, I'm not interested in being an early adopter to these changes at that price point. HOWEVER, I would love to be able to purchase the new low-profile padding to retrofit my existing Gold.