Back at Animal kingdom lodge now so can write a bit more, sorry for the sketchy details was trying to get back to resort with 1.5 year old in tow.
Few things.
Disney CM response was amazing ... literally amazing. Seemed like specific CMs were assigned to specific characters to evacuate it was very well coordinated.
The perimeter they set up was crazy well done and surprisingly was set up by custodial. Like those sweeping folks everywhere just seemed to appear from everywhere and set up a blockade with criss crossed brooms and stuff and then expanded to perimeter slowly.
The panic (near where we were) was caused by people (one person in particular near us) who started screaming about there being gas on fire and possible explosions etc... and people started running and pushing strollers like bulldozers.
All in all exceptionally well handled by Disney staff and I very much hope that both everyone is ok and that Disney takes this as a demonstration of how WELL their systems are set up rather than the risk that exists.